perspiration came down like raindrops
Sweating like rain, Chinese idiom, Pinyin is Hu à h à NR ú y à, meaning to describe the hot weather sweating. It comes from Qi CE Yi, the strategy of the Warring States period.
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
It is also used as predicate, attributive and adverbial to describe tiredness or sweating. He is very alert, and he is very unhappy. Notes on Yuewei thatched cottage - luanyang Xiaoxia Lu 5 by Ji Yun of Qing Dynasty
perspiration came down like raindrops
It's like an arrow to return home - guī xīn sì jiàn