Ammoniometer
[机] 氨量计
🗣️ 情景例句
Maybe you read our ads in the newspaper.
也许你在报纸上看过我们的广告。
We know not what is good until we have lost it.
有的时候不爱惜，失了以后空叹息。
Some old people are oppressed by the fear of death.
有些老年人因为怕死而感到烦恼。