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
You're right, Ellen.
你说得对， Ellen。
To conclude the business, you need to cut your price at least by 4%,I believe.
我认为要做成这笔交易，您至少要降价4%。
He was a famous professor of physics.
他是一位著名的物理教授。