It is bad manners to be absent-minded when other people talk to you.

别人同你讲话时出心不在焉是没礼貌的。

youdao

The fact that he will grow up to be the absent-minded professor is the subject for another post.

我忘了。（事实上他长大成为不专心的教授是由于别的原因造成的。

youdao

Men who are habitually shamefaced or absent-minded before the ideal-that is, before the actual nature of things-cannot expect to be real readers of books.

对理念——也就是万物的真正本质——习惯性羞愧或麻木的人，不可能成为真正的读者。

youdao