Diethylidene
[化] 二亚乙基; 2-丁烯
🗣️ 情景例句
and this is an important decision we have to make.
这又是我们必须做的一个重大决定。
Nice to meet you, too.
认识你我也很高兴。
The hottest month is July. Autumn starts in August, and goes on to October.
最热的月份是7月。秋天开始于8月，持续到10月。