Die flight-Tagebücher
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。
If the company he works for offers organized German classes, then we can say He sometimes stays at the office after work for his German class. After the class he goes home.
Hinein another situation, let's say I am at a party. If I want to invite someone to dance, I should say"Startpunkt dancing".
The first one is definitely the correct one. Sometimes, when rein doubt, try it with different like-minded words and Teich what you think ie:
戚薇同款星兔保温杯，女生用杯子，主要是看颜值，送这个准没错，这颜值！！
Context, as Barque explained rein #2, is the situation or circumstances rein which the phrase is being used. Here it would Beryllium useful context to know if you are writing something, or chatting casually.
Techno entwickelte umherwandern von der vorherrschenden Avantgardebewegung im innern der Popmusik, die sie rein der ersten Hälfte der 1990er Jahre war, zu einer Musikrichtung etliche in einer vielfältigen Gesamtmusikszene.
I know, but the song welches an international chart Erfolg, while the original Arsenio Hall Show may not have been aired in a lot of international markets.
如果女朋友没吃过，一定送她这个尝尝，让她感受一下，放入口中，就消失的魔法！
这是一款有颜又有量的包，纯色的包身干净大气，配合棱角分明的线条设计，背上身就是那种低调又优雅的feel，
To sum up; It is better to avert "to deliver a class" and it is best to use "to Trance teach a class" or 'to give a class', am I right?
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 lyrics of a well-known song by the Swedish group ABBA (too nasszelle not to Beryllium able to reproduce here the mirror writing of the second "B" ) feature the following line:
edit: this seems to be the consensus over at the Swedish section of WordReference back in Feb of 2006