These verbs mean to be without something, especially something that is necessary or desirable.

这些动词的意思是没有某物，尤指该物是必须的或是合乎需要的。

youdao

Of course, it may not be necessary or desirable to build a cat or a human brain, since we already have fully functional cats and humans.

当然，真的制造一个猫脑或者人脑没有必要也很不值得，因为我们已经有了具备全部功能的人和猫。

youdao

In highly complex scenes, it is sometimes necessary or desirable, but not ideal, to render only the bounding boxes of unselected objects.

在高度复杂的情景下，有时只绘制非选择对象的边框是必要的。或者可以满足要求，虽然不是最完美的。

youdao

Liam McArthur, speaking for the Scottish Liberal Democrats, said wholesale delay was neither necessary or desirable but ultimately it should be up to schools to decide they needed to delay.

BBC: Labour: Curriculum for Excellence

He has to persuade the court that it would be "necessary or desirable in the interests of justice" for the original inquest verdicts to be quashed - because, for example, of "the discovery of new facts or evidence".

BBC: Liverpool

But all of this begs the question: Is the splashy TV-style content necessary, or even desirable, on the Web, a medium that is able to lure millions of eyeballs with stuff made by amateurs?

FORBES: AOL's Prime-Time Strategy