Was bedeutet?
Künstlerinnen zumal Künstler experimentieren mit innovative Technologien des weiteren ins leben rufen so einzigartige Klanglandschaften, die die Zuhörer in ihren Zauber ziehen ebenso sie auf eine akustische Ausflug aufsammeln.
特别适合胳膊比较细的女生，会有一种特别的气质。而且还是江疏影同款的哦！
It is not idiomatic "to give" a class. A class, in this sense, is a collective noun for all the pupils/ the described group of pupils. "Our class went to the zoo."
Let's take your example:One-on-one instruction is always a lesson, never a class: He sometimes stays at the office after work for his German lesson. After the lesson he goes home. Notice that it made it singular. This means that a teacher comes to him at his workplace and teaches him individually.
It can mean that, but it is usually restricted to a formal use, especially where a famous expert conducts a "class".
Hinein your added context, this "hmmm" means to me more of an expression of being impressed, and not so much about thinking about something. There is of course a fine line.
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。
本文涵盖了生日礼物、情人节礼物、新年礼物、跨年礼物、周年庆礼物等每个该送女生礼物的节日，帮你解决经常性不知道送什么的烦恼！
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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。
That's life unfortunately. As a dated BE speaker I would not use class, I would use lesson. May Beryllium 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。
Only 26% of English users are native speakers. Many non-native speaker can use English but are not fluent. And many of them are on the internet, since written English is easier than spoken English. As a result, there are countless uses of English on the internet that are not "idiomatic".
edit: here this seems to be the consensus over at the Swedish section of WordReference back rein Feb of 2006