Ethylethylene
丁烯-1
🗣️ 情景例句
Don't let me interrupt you.
别让我打搅你们。
Law is a bottomless pit.
法律是无底的深渊。
Yes, I remember. You were not here yesterday. What was wrong? Were you ill?
是的，我记得。你昨天没有来。怎么啦？你病了吗？