Carbocation
碳阳离子
🗣️ 情景例句
Dogs make great pets, but don't leave them alone with small children.
狗是最好的宠物，但不要让狗和小孩子单独在一起。
The day is long to him who knows not how to use it.
百无聊赖。
What can I do for you?
要我帮忙吗？