Covalent
a. 共有原子价的, 共价的
🗣️ 情景例句
Bye, Marilyn. Hope to see you again.
再见 Marilyn。希望能再看到 。
We've only sold our product at trade fairs, not in an on-going sales campaign.
我们的产品只在商展时展售，而没有办促销活动。
Most of them were able to climb out in time. However four men were not quick enough to escape the flames.
大部分工人能够及时逃生。可是有4个工人来不及逃离火场。