Ethylethylene
丁烯-1
🗣️ 情景例句
Biology and mathematics.
生物学和数学。
Laugh, and the world laughs with you; weep, and you weep alone.
你笑，人人陪你笑；你哭，惟独你自哭。
We will take the Endeavour. It is a good, strong ship, though not very fast. There will be a lot of room below for stores.
我们用“奋力号”。它虽然速度不算快，但却是一只完好、结实的船。船体下面有很多地方还可以放储存品。