Sepsometer
空气有机质测定计
🗣️ 情景例句
We'd prefer a credit card, if you have one.
如果你有信用卡，我们较喜欢信用卡。
Mr. Smith, would you like to start things off?
史密斯先生，你要开始做事了吗？
I'm afraid I can't.
恐怕不能。