Radioactive purity
[化] 放射性纯度
🧩 词语组成解析
🗣️ 情景例句
Nets for tennis and badminton and so on.
有网球和羽毛球用的网等等。
A bird is known by its note,and a man by his talk.
鸟以声闻，人以言知。
I appreciate John's helping in time.
我感谢约翰的及时帮助。