Velocitron
质谱仪
🗣️ 情景例句
Let us try it!
让我们试试吧！
They who cannot do as they would,must do as they can.
不能如愿而行，也须尽力而为。
It is nine o'clock.Mr.Sawyer usually reads his newspaper at night.But he's not reading his newspaper tonight.
现在是9点钟。索耶先生通常是在晚上看报，但今天晚上他没看报。