Alkylene
亚烃基, 烯化, 烷撑
🗣️ 情景例句
Something that might be surprising to you.
一件也许会让你吃惊的事。
Count not your chickens before they are hatched.
不要过早乐观。
What I saw made me very sad.
我所见到的一切使我非常难过。