To be sure of it
To be sure, Chinese idioms, Pinyin is d ǔ é RL ù nzh ī, which means to discuss exactly. It comes from Yu Lin by Pei Qi of Jin Dynasty.
Idiom usage
He is loyal, intelligent and courageous. It is not a time to reduce his past.
The origin of Idioms
Pei Qi's Yulin in Jin Dynasty said: "Lin Gongyun: he is full of satire, takes Zuozhuan and pursues Zheng Kangcheng. He is a high-ranking disciple. If he talks about it, he will never leave the dust bag!"
Idiom explanation
DUK: it's practical. Exactly.
To be sure of it
stand by watching others battle - zuò bì shàng guān
take instant advantage of an opportunity that comes only once in a long while - jiàn tù gù quǎn