Challenges
n. 挑战( challenge的名词复数 ); 要求; （警卫等）查问口令; 怀疑
🗣️ 情景例句
I would like to send this by registered mail, please.
我想把这封信挂号寄出。
How! A fight!
哗，打架啦！
Which speech are you going to?
你打算去听哪个报告呢？