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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。Actually, they keep using these two words just like this all the time. In one and the same Liedtext they use "at a lesson" and "rein class" and my students are quite confused about it.edit: this seems to be the consensus over at the Swedish section