Dialkene
二烯烃
🗣️ 情景例句
The policemen could not cope with the crowds.
警察不能对付群众。
Yes,and I like the color too.It matches your hat.
是的，我也喜欢这颜色。和你的帽子很相配。
We succeeded in lighting the fire.
我们成功地点着火。