Determeter
(往复式)去污试验仪
🗣️ 情景例句
Cooking dinner for the entire family is not so easy.
给全家人做晚餐真不是件容易的事。
The wealth of the mind is the only true wealth.
精神财富是唯一的真正财富。
We have an old musical instrument.
我家有件古乐器，