房子里堆满了自己既不喜欢又用不到的东西够让所有人烦心的。

Stuffing your house with things that you do not like and do not need won't make anybody happy.

youdao

亦或是你为什么不移除你永远用不到的硬件驱动包来节约你的硬盘空间呢。

Or why not remove drivers for hardware you'll never need and save disk space?

youdao

它们的确可以收发邮件，不过为什么要有一个大多时候用不到的小型键盘?

Yes, they can send and receive e-mail, but why have a tiny keyboard when you do not need it for most of the phone's other functions?

youdao

And if you have your calculator all set up as you love and you don't want to change it, then maybe you should just go and get an $8.00 scientific calculator that doesn't have any of the graphing functions, because you don't actually need them, so that's a better option for you, you can do that as well.

如果你的计算器里已经按照你的喜好编好了,而你又不想改动，那么或许你可以,去再买一个八美元的科学计算器,它没有任何绘图功能，因为实际上你也用不到这些，所以这对你来说是一个更好的选择，你也可以这样做。

麻省理工公开课 - 化学原理课程节选

If it's possible, use animals that don't feel pain, or use lower forms of life.

如果可以的话，请使用那些感觉不到疼痛的动物，或者用低级生物。

需要动物实验吗？ - SpeakingMax英语口语达人

I had a picture of the Lowell Mills insignia but you don't need that.

我还有一张是关于,洛厄尔.米尔斯的徽章的,但是我们用不到它

耶鲁公开课 - 美国内战与重建课程节选