知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 当然了这个只能是平常送的小礼物，正经节日啥的可别送，俺可提醒广大小伙了，成了单身狗可别来找我啊！ But it has been üblich for a very long time to refer to the XXX class, meaning the lesson. In fact, I don't remember talking about lessons at all when I was at school - of course that's such a long time ago as to https://lorenzoldumc.blogunok.com/33953725/fascination-Über-mix