It may not help you tie your shoe but that little plastic tip keeps the rest of the shoelace, the shoe string from unraveling into weak and useless threads.

它可能不能帮你系鞋带，但那小小的塑料头可以让鞋带的其余部分不会散开成脆弱无用的线。

youdao

This is both dangerous and useless.

这样做既危险，又毫无意义。

youdao

More importantly, it's just plain useless, and useless buttons are never a good thing.

更重要的是，它毫无用处，而没有用的按钮不是好东西。

youdao

And,in one language in Botswana, there are three main kinds of plants and animals: edible "eat-things", harmful "bite-things" and "useless things."

VOA: special.2009.12.02

It's not a cyclical and useless definition.

这不是一个循环式的,没有意义的定义

耶鲁公开课 - 基础物理课程节选

And then remember how you solve this 'cause otherwise completely useless exercise.

记住我是怎么解决这个问题的，否则就是一次,无意义的演练了，对吧。

哈佛公开课 - 计算机科学课程节选

In her own obscure and useless way, she tried to defend her freedom, tried to learn.

NEWYORKER: Clara

But along with obsolete and useless computers are innumerable valuable parts--at least to an expert eye.

FORBES: Magazine Article

The wood from the West Coast of America is diseased and useless for timber, they say.

BBC: Biomass may hinder climate fight