Allotropical
a. 【化学】同素异形的
🗣️ 情景例句
Who is it?
谁呀
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”。
What's this in English?
这用英语怎么说？