That's right, what Zhang Nan took out was the sanitary napkin known as the Friend of Women. Although it is impossible for Zhang Nan to use this thing in his life, Liu Bing can.

Although Zhang Nan's knowledge of this thing only exists in theory, Zhang Nan knows that this thing has a huge amount of water absorption, and Liu Bing must have no problem using this thing. It doesn't matter if it's a leak, it's a flood.

"As the saying goes, there are no wings during the day, move casually, and there are wings at night, no side leakage, come, Lao Liu, take it." After Zhang Nan finished speaking, he handed over the Hushu treasure in his hand to Liu Bing.

"Master Zhang, how do you use this thing?" Liu Bing asked with a puzzled expression.

"Hey, this is easy, look." Zhang Nan said, took out a piece from the box in Liu Bing's hand, and then tore open the sticker on one side and said: "Stick this side that can stick things to the underwear, just use it, when the time comes, you can move as much as you want, and you don't have to worry about side leakage." Zhang Nan said with a smile.

"Lord Zhang, you ......" Liu Bing also showed an embarrassed but polite smile.

"Hahahahaha After Zhang Nan finished speaking, he left the palace, looking at the back of Zhang Nan leaving, Liu Bing also showed a smile.

"This adult who travels through the family is really different from everyone else." Liu Bing said silently in his heart.

Not much.

"Brought all the words to Qingquan?" Li Er asked while looking at the excerpt that Zhang Nan wrote to him about military reform.

"If you go back to the emperor, you brought it." Liu Bingdao.

"Well, did that kid say anything?"

"If you go back to the emperor, no, but Lord Zhang gave the old slave three pairs of underwear." After Liu Bing finished speaking, he took out the box containing underwear from his arms.

When Li Er heard Liu Bing's words, he didn't look at it, and then said, "This guy will buy people's hearts." ”

Hearing Li Er say this, Liu Bing hurriedly said with sincere fear: "Please also ask the emperor to take a clear look." ”

"Okay, I don't blame you, anyway, this thing is just a small object, you can take it and wear it, if you really have other thoughts, how can I keep you until now." Li Er continued without raising his head.

"The emperor is wise." Liu Bing wiped the cold sweat from his head.

"What did this guy give you back?"

"If you go back to the emperor, Lord Zhang also gave the old slave an object called Hushu Bao." Liu Bing is also honest and doesn't dare to hide anything, after all, if Li Er really wants to know about this kind of thing, it is too simple.

"Hushubao? Bring it to me? As soon as he heard that Zhang Nan actually gave Liu Bingxin an object, Li Er immediately became interested.

However, after seeing what Liu Bing had in his hand, Li Er was stunned at first, and then laughed, laughing and scolding Zhang Nan while laughing.

When Liu Bing saw Li Er's appearance, he was also very puzzled.

"Your Majesty, what are you laughing at?"

"Hahahaha, this guy Qingquan actually gave you this thing." Li Er smiled out of breath.

"Your Majesty, have you ever seen this thing?" As soon as he heard that Li Er had seen this thing, Liu Bing's heart immediately put down, and he was afraid that Li Er would be interested in this Hushu Bao, and then take this thing away.

"Yes, yes, of course I do." Li Erdao.

"Oh yes, didn't this guy say anything else to you?" Li Er continued to ask.

"Something else? Your Majesty, let the old slave think about it. Ah, Lord Zhang really said something, but the old slave didn't know what Lord Zhang meant, Lord Zhang told the old slave that there was no wing protection during the day, and he moved casually, and there were wings at night, and he didn't leak sideways. ”

"No leaks?! Hahahaha, Liu Bing, Liu Bing, you, you, hahahaha, go, put on this underwear that Qingquan gave you, remember to bring this Hushu Bao with you, it is also a piece of Qingquan's heart. Li Erdao.

Seeing Li Er's appearance, Liu Bing hesitated more and more, so Liu Bing said: "Your Majesty, what's wrong with you, you should tell the old slave." ”

"You really want to hear it?" Li Er looked at Liu Bing with a puzzled expression.

Then Liu Bing nodded seriously.

"This thing is used by women during menstruation." Li Er thought about it for a while, but decided to tell Liu Bing the truth.

"Ahh Hearing Li Er say this, Liu Bing suddenly blushed.

"But you don't have to think about it, I don't think Qingquan has any other meaning to give you this thing, think about it, even women use this for menstruation, it must be easy to use, so he really wants to help you." Li Er opened his mouth to explain.

"Yes, what the emperor said is very true, if Lord Zhang can give the old slave such a thing, he must also want to help the old slave, and the old slave knows it in his heart." Liu Bingdao.

"Well, it's good that you know."

In fact, Li Er didn't know what this thing was at first, after all, Li Er just heard what Empress Changsun said. Regarding the thing of Hushubao, Cui also introduced it to Empress Changsun, and Empress Changsun thought it was good after using it, and sold it to the concubines of the harem.

Every month, Cui will be called to the palace by Empress Changsun, nominally Empress Changsun wants to talk to Cui about her heart, but in fact, Cui is going to deliver goods, after all, Comrade Li Er's harem has a large number of people, and the amount of money used every month is relatively large.

Li Er has only heard of this thing, but he has never seen the real face, after all, this thing belongs to women's more private items, although Li Er is curious, but he is not perverted to the point that he must take a look.

But today, after hearing what Liu Bing said, and thinking about the efficacy, Li Er was sure that this thing was a new menstrual weapon that was widely circulated in the harem.

After Zhang Nan returned to the house, the first thing he did was to lock himself in the study, although Zhang Nan's study was never used for reading, but today Zhang Nan really needs him.

Because Zhang Nan plans to build a national stadium belonging to the Tang Dynasty outside Chang'an City, horse racing is just one of the functions, this stadium must be able to accommodate at least 200,000 people at the same time, you know, in later generations, the largest Marakner Stadium is only 220,000 people.

But Datang has nothing else, that is, the place is big, there is money, and there is free labor, so Zhang Nan thinks that it is still possible to build a gymnasium like this.

And Zhang Nan plans to start strengthening the physical fitness of the people after the gymnasium is established, so it is imperative to implement the sports meeting, and taking advantage of the sports meeting, Zhang Nan can still make a lot of money.

After thinking about it for a long time, Zhang Nan picked and choose, and finally chose the appearance of the Bird's Nest Stadium, after all, Zhang Nan still likes this design concept very much.