Aethylenum
乙烯
🗣️ 情景例句
I can see that.
这一点我明白。
A friend is never known till a man have need.
不到患难时，永远不能认识真正的朋友。
The American president who fought for the freedom of slaves in the USA.
为美国奴隶的自由而战的美国总统。