Diacetylene
联乙炔, 丁二炔
🗣️ 情景例句
What was your best subject in college?
大学时你哪门功课最好？
Bad workmen often blame their tools.
拙匠常怪工具差。
Good. Put it on the small table, please.
好，把箱子放在那个小桌子上吧！