Carbocation
碳阳离子
🗣️ 情景例句
He accepted an offer of help.
他接受了援助的建议。
I ask him to do the washing now.
我要求他现在做洗涤工作。
but by now the Thermopylae was over five hundred miles ahead.
但此时，“赛姆皮雷”号早已在500多英里之遥了。