Polyacetylenes
多炔
🗣️ 情景例句
Don't let it get you down. it will be over with soon.
别为此烦恼。 事情很快就会过去的。
A new broom sweeps clean.
新官上任三把火。
John works very hard. He goes to work early.
约翰工作很努力。他早早上班。