wiping off their sweat drops makes it look like rain
It's a Chinese idiom. Pinyin is Hu ī h à NCH é ngy ǔ, which means to wipe sweat with your hands. It's like rain when it's spilled. It's used to describe many people. It comes from Qi CE Yi, the strategy of the Warring States period.
Notes on Idioms
Wave: Sprinkle, splash.
The origin of Idioms
"Qi CE I of the Warring States period" says, "the curtain is made of lapels, the curtain is made of hands, and sweat is made of rain."
Idiom usage
In addition, it can be used as predicate to describe many people. Examples biographies of Su Qin in historical records: "the car hub strikes, the shoulder rubs, the lapel becomes a curtain, the lifting of the eyebrows becomes a curtain, and the sweat becomes rain." it's time to brush your shoulders and sweat. I'm very thirsty. (the tenth chapter of the flower of the evil sea by Zeng Pu in Qing Dynasty)
Idiom story
During the Warring States period, Su Qin, a lobbyist, went to the state of Qi to persuade King Xuan of Qi to unite with him to fight against Qin. He said: "there are 70000 families in Linzi. Each family can produce three men to serve as soldiers. The place is very rich. There are many people in the street. They hold up their sleeves like a tent, and each one waves a sweat. It's like rain. Do they have such strength to yield to the state of Qin?"
Chinese PinYin : huī hàn chéng yǔ
wiping off their sweat drops makes it look like rain
Superior, strong, inferior and weak. guì zhuàng jiàn ruò
read by the light of fireflies at the windows and the reflection of snow on the table. yíng chuāng xuě àn
something redundant and not needed. fù zhuì xiàn yóu