Photoextinction
比浊分析法
🗣️ 情景例句
What's wrong with wanting to be on the school board?
想进入联合校董会有什么错？
She knew that a vocation this year was out of the question.
她知道今年不可能有假期。
That one is only 90 fen. That's cheap.
那支笔只有九毛钱，很便宜。