多余动作，劳而无获；

No gain for unnecessary movements;

youdao

为了减少手指的多余动作带来的机械“噪声”手指应该尽量保持在琴键上。

And in order to reduce mechanical "noise" from extraneous finger motions, the fingers should be on the keys as much as possible.

youdao

我在写技术文章时注意句子中的动作时态和多余词。

I watch my action tense and wordiness in sentences when I am writing my technical diddley.

youdao

I get to the end of the loop, and I actually do a little bit of wasted motion there. And the little bit of wasted motion is, I take the value at i, store it away temporarily, take the value where min index is pointing to, put it back in there, and then swap it around.

我走到了循环的末尾，事实上我做了多余的动作了,有点多余的是我把i的值，临时保存起来了，看看MinIndex指向的值，放回到哪里，然后再交换。

麻省理工公开课 - 计算机科学及编程导论课程节选