Complaining is usually most effective when it is done politely but firmly, and especially when the consumer can demonstrate what is wrong with the item in question.

投诉时语气礼貌且态度坚决通常是最有效的，尤其是当消费者能说明这个物品哪里出了问题时，更加如此。

youdao

It is done in two main ways.

主要通过两种途径。

youdao

It is done always using the same methods.

通常可以用一致的方法得出。

youdao

In many parts of the world it is done when a baby is a few days old.

VOA: special.2009.04.01

And a lot of it is done with real objects, but there's also animated versions so here is an animated example.

大部分实验启用了实物,但也有些动画视频,这就是个动画的例子

耶鲁公开课 - 心理学导论课程节选

It says if this is a string of length 0 or 1, I'm done. I'm going to return the answer true.

我就会返回答案为真，否则的话我得判断它。

麻省理工公开课 - 计算机科学及编程导论课程节选

An act is willful if it is done with knowledge that it violates the law.

FORBES: Tax Reporting of Foreign Financial Assets: A Tale of Two Acts

We need to continue to study fracking, and to ensure that it is done safely.

WSJ: Should Fracking Be Regulated by the Feds or the States?

If it is done in crisis, it will be a jolt and harder to sell.

FORBES: Energy Infrastructure: Critical to Economic Momentum