Difluorinated
二氟化的
🗣️ 情景例句
I try to keep a regular schedule every day.
我每天努力遵守有规律的安排。
The best teacher one can have is necessity.
我们能得到的最好教师是“需要”。
He was obviously very nervous and for some minutes stood awkwardly before the microphone.
他显然非常紧张，局促不安地在麦克风前站了好几分钟。