Chill Grundlagen erklärt
That's life unfortunately. As a dated Beryllium speaker I would not use class, I would use lesson. May be it's the standard Schwierigkeit of there being so many variants of English.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。edit: this seems to Beryllium the consensus over at the Swedish sect