“铜的”造句
它们有哑
铜的，古
铜的和镀银的。
They are available in polished brass, antique brass or silver-plate.
要求学生们检验
铜的纯度.
The students are asked to prove the purity of copper.
夹头和电极之间的接触面是银的或
铜的.
The contact area between clamp and terminal is either silver or copper.