Be strict
Yan Chen Yi Dai, a Chinese idiom, Pinyin is y á NCH é NY à D à I, which means to be ready to fight and wait for the enemy. From Zizhitongjian · Hanji · the third year of Emperor Guangwu's founding.
The origin of Idioms
"Zizhitongjian · Hanji · the third year of Emperor Guangwu's founding of the people's Republic of China" says: "in Jiachen, the emperor personally led the six armies, and was ready for them
Analysis of Idioms
Synonym: to be sold at a price, to be unreasonable, to be ready
Be strict
It's easy to hide an open gun, but hard to defend a hidden one - míng qiāng hǎo duǒ,àn jiàn nán fáng
beat drums and clang gongs -- in + battle - jī gǔ míng jīn
have quick wits idea occurred to one 's mind at the crucial moment - jí zhōng shēng zhì