Polyborane
聚硼烷
🗣️ 情景例句
OK.
好的。
That's not a good idea!
这样不太好吧！
And anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bed was flat.
凡是稍稍想过大海海底的人大概都会认为海底是平坦的。