Jetometer
潤滑油腐蝕性測定器
??? 情景例句
The way to learn a language is to practice speaking it as often as possible.
學習一門語言的方法就是要盡量多地操練說出它來。
I mean it. I'm serious. I'm no kidding!
我是認真的。
and it is only in the seas and rivers, and sometimes lakes, where mud and sit have been continuously deposited,
所以只有在泥沙不停淤積的海洋和江河里，有時在湖泊里，