Dialkene
二烯烃
🗣️ 情景例句
I think that's a great idea.
我觉得这个主意真不错。
I asked him to check it for me, but he wouldn't.
我请他帮我检查，但是他不肯。
The nomads who made these markings lived by hunting and fishing during the last Ice Age which began about 35,000 B.C.and ended about 10,000 B.C.
这些痕迹是游牧人留下的，他们生活在从公元前约35，000年到公元前10，000年的冰川期的末期，以狩猎、捕鱼为生。