Fast and fast
As a Chinese idiom, Pinyin is x ī NGF ē IDI à NJ í, which means like a meteor falling, like lightning rushing, to describe a very rapid or urgent situation. It's from "the moon worship Pavilion: the order of peace".
The origin of Idioms
Yuan Shi Hui's "baiyueting · fengxuhefan" said, "if you are in a hurry, you will gallop to the post. When you hear back, you will be in a hurry."
Idiom usage
Used as an object or adverbial; used in figurative sentences.
Fast and fast
be engaged in an occupation not related to one 's training - yòng fēi suǒ xué
the grass looks like a green carpet - lǜ cǎo rú yīn
stimulating oneself , but controlling one 's presence of mind - dòng xīn rěn xìng