The discussion method is time-consuming and tangental.

那种讨论方法既浪费时间又与脱节。

His talk branched off from the subject.

的话偏离了。

His mind kept branching off into the contemplation of silly things.

能专心于而尽想着愚蠢的事情。

He talked a lot, but never really came to grips with the subject.

了很多, 但是没有真到。

Cut the waffle and get to the point.

别胡扯,。