Ethylethylene
丁烯-1
🗣️ 情景例句
No. But I have to.
没有 ，但有此必要。
Flattery brings friends, but the truth begets enmity.
奉承惹人喜，直言招人仇。
Some so-called 'modern' pieces have been on display for nearly eighty years.
有些所谓的“现代”艺术品在那里已经陈列了近80年了。