This pen is useless.
这支笔没用了。
He knew it was useless to protest.
他知道抗议是徒劳的。
It's useless worrying about it.
为这事担心无济于事。
She tried to work, but it was useless(= she wasn't able to) .
她很想做事，但力不从心。
not very good at sth; not able to do things well
I'm useless at French.
我的法语不太行。
Don't ask her to help. She's useless.
别求她帮忙。她没那个能耐。
1.没用的,无益的,无效的
2.〈俚〉身体不舒服的,没精神的
1.useless objects have no purpose or cannot do what they were designed to do; useless activities are not effective in achieving the purpose that they were intended to achieve; if someone is useless, they are not any help to you or are not capable of achieving anything; a part of your body or mind that is useless cannot be used because of an illness or injury
1.This does not mean that it's useless to get over 10% but it does mean that the benefits drop off as you get higher and higher Magic Find.
这不意味着克服10%但是当你得到越来越高的魔力，好处减少，这确实意味着，是无用的发现。
2.Before he had reached the central portion of the city he thought the whole matter over and decided it would be useless.
在到达市中心之前，他把整件事情想了一遍，认定去了也没用。
3.This diet is useless because it's just as easy to make your own sandwich and take a walk.
这个减肥法是没用的，因为这就和你自己制作一个三明治和出去散步一样简单。
4.How much times, we made several attempts to appeal, useless. Alarm, useless.
多少次，我们几度上诉无门，报警未理。
5.In western countries, to offer seat to the old would be regarded as you are thinking them as if they are useless.
正在西欧，给老年人让座会被视为一种以为他们（老年人）有力的表示。
6.The three most useless things to a pilot are the altitude above you, runway behind you and a tenth of a second ago.
对于飞行员来说，最没用的三件事：在你上面的高度、在你背后的跑道，以及刚过去的十分一秒。
7.But when a marriage is making them feel bad, everybody seems to "throw up their arms" and decide that it's useless to try anymore.
但是当婚姻让他们感觉不好时，每一个人才会放弃他们自己的一些兴趣爱好，可这些都是无用的努力罢了。
8.I thought about this , but it would be useless. Manager thinks highly of him.
我想过，但不会有用的，经理对他的评价很高。
9.He would like to try some other drugs which were also been told useless by his friend, so he gave up drug treatment.
他还想继续尝试其它的药物，后来听朋友说其它的药物也不管用，于是他放弃了继续用药治脱发的打算。
10.So it would be useless if, in terms of research, at least for us, if he would say, well, some people are born with it, and others are not.
因此如果从研究的角度，至少对我们而言，如果他要说一些人就是与生俱来而另一些人则没有的话，这就一无是处。