Vinylmethylketone
丁烯酮
🗣️ 情景例句
Yes. About four years ago.
是的 ，大约四年前走的。
You know the proverb, Smile and the world smiles with you, cry and you cry alone.
要知道有句格言“微笑，世界与你同欢乐；哭泣，你只能独自悲伤”。
Where did you get such a nice tan?
你到哪把皮肤晒成棕色的？