Liquidensitometer
液体密度计
🗣️ 情景例句
It was an extremely difficult and dangerous task.
这是一项极度困难的危险的工作。
An enemy's mouth seldom speaks well.
狗嘴里吐不出象牙。
Yes, please. This is Bill here. Is that Mrs Read?
是的，劳驾了。我是比尔。你是里德夫人吗？