Cooedinate bond
[机] 池配位键
🧩 词语组成解析
🗣️ 情景例句
When he came to the States five years ago, he had only forty dollars in his pocket.
五年前他来美国时，口袋里只有40美元。
It is the bridle and spur that makes a good horse.
要把马练好，缰绳靴刺少不了。
You are just saying that.
你只是说说而已。