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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。

It depends entirely on the context. I would say for example: "I am currently having Italian lessons from a private Coach." The context there is that a small group of us meet regularly with ur Kursleiter for lessons.

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。

The wording is rather informally put together, and perhaps slightly unidiomatic, but that may be accounted for by the fact that the song's writers are not English speakers.

Actually, they keep using these two words just like this all the time. In one and the same Songtext they use "at a lesson" and "hinein class" and my students are quite confused about it.

In your added context, this "hmmm" means to me more of an Ausprägung 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。

Now, what is "digging" supposed to mean here? As a transitive verb, "to dig" seems to have basically the following three colloquial meanings:

bokonon said: For example, I would always say "Let's meet after your classes" and never "after your lessons" but I'kreisdurchmesser also say "I'm taking English lessons" and never "I'm taking English classes". Click to expand...

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 click here 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。

I think river has hit the nail on the head: a lesson can Beryllium taken either privately or with a group of people; a class is always taught to a group.

edit: this seems to Beryllium the consensus over at the Swedish section of WordReference back rein Feb of 2006