Velocitron
质谱仪
🗣️ 情景例句
I am unfamiliar with law.
我对法律不熟悉。
An empty bag cannot stand upright.
空袋不能直立。
If we buy the smaller one, the IBM PC386, we might have to change it in a few years' time for a bigger one.
如果我们买一台较小的IBM386的话，过几年可能就得换一台较大的机子。