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1·She knew it was useless to protest.

她知道抗议是没用的。《柯林斯英汉双解大词典》

2·This pen is useless.

这支笔没用了。《牛津词典》

3·But I put it to you that they're useless.

但我要告诉你，他们没用。《柯林斯英汉双解大词典》

4·I still feel inadequate, useless and mixed up.

我仍旧感到能力不足，毫无用处，混淆不清。《柯林斯英汉双解大词典》

5·She sits at home all day, watching TV and feeling useless.

她整天坐在家里，看电视、感到自己没用。《柯林斯英汉双解大词典》

6·You may see yourself as useless, incompetent and blameworthy.

你也许会认为自己无用、能力差、应该受到指责。《柯林斯英汉双解大词典》

7·The camel's feet, well adapted for dry sand, are useless on mud.

骆驼的脚十分适合干旱沙地，但在泥地上毫无用处。《柯林斯英汉双解大词典》

8·Shockingly, this useless and dangerous surgery did not end until the 1930s.

令人震惊地，这种毫无作用又危险的外科手术直到20世纪30年代才结束。《柯林斯英汉双解大词典》

9·I became a distraught, worried mother, a useless role if ever there was one.

如果有个心烦意乱、忧心忡忡的母亲，一个完全无用的角色，那就是我。《柯林斯英汉双解大词典》

10·Astronauts will make a final attempt today to rescue a communications satellite from its useless orbit.

宇航员们今天将做最后一次尝试，把一颗通讯卫星从它无用的轨道上拯救出来。《柯林斯英汉双解大词典》

无用

1·Astronauts will make a final attempt today to rescue a communications satellite from its useless orbit.

宇航员们今天将做最后一次尝试，把一颗通讯卫星从它无用的轨道上拯救出来。《柯林斯英汉双解大词典》

2·It's useless to fire away with such trivial details.

喋喋不休地谈这些琐碎细节是无用的。《新英汉大辞典》

3·Today almost everyone has a smart phone, booths are out of date and seem to be useless.

今天，几乎每个人都有一个智能电话，电话亭已经过时了，似乎是无用的。

4·Shielded by third-party payers from the cost of our care, we demand everything that can possibly be done for us, even if it's useless.

由于我们的医疗费用由第三方支付，我们要求尽可能为我们做任何事情，即使它是无用的。

5·Shielded by third-party payers from the cost of our care, we demand everything that can possibly be done for us, even if it's useless.

由于我们的医疗费用由第三方支付，我们要求尽可能为我们做任何事情，即使它是无用的。

没用的

1·But I put it to you that they're useless.

但我要告诉你，他们没用。《柯林斯英汉双解大词典》

2·She sits at home all day, watching TV and feeling useless.

她整天坐在家里，看电视、感到自己没用。《柯林斯英汉双解大词典》

3·She knew it was useless to protest.

她知道抗议是没用的。《柯林斯英汉双解大词典》

4·I soon became aware that campaigning is useless.

我很快就意识到，在公司倡导（创新）是没用的。

5·The fear of being useless, fear of being without money, or the fear of doing something different.

惧怕成为一个没用的人、惧怕没有钱或惧怕做新标新立异的事。

没有用

1·It is useless for you to tempt me!

你诱惑我是没有用的！

2·When Grethel heard this she began to cry bitterly; but it was all useless, she was obliged to do as the wicked witch told her.

当格雷特听到这些她开始悲伤的哭泣；但是这些都没有用，她被迫去做邪恶的巫婆让她做的事情。

3·You can store the report in electronic format but unless you are processing the information and knowledge in the document it is for the most part useless.

你可以使用电子方式存储整个报告，但如果不对文档中的信息和知识进行处理，那么大多数情况下这样存储的报告是没有用的。

4·Developing software rapidly is useless if you cannot ensure the quality.

如果不能确保质量，快速开发软件能力就没有用。

5·Sometimes useless features stick around in a species simply because they're not doing much harm.

有时人们不会去改掉一些没有用的特点，只因为它们并没有什么坏处。

毫无用处的

1·I still feel inadequate, useless and mixed up.

我仍旧感到能力不足，毫无用处，混淆不清。《柯林斯英汉双解大词典》

2·Any preserves we set up to protect endangered species may become useless as the species are forced to migrate along with their natural homes.

我们为保护濒危物种而建立的任何保护区都可能变得毫无用处，因为这些生物被迫随着它们的自然栖息地迁移。

3·Such water would be useless in improving physical performance, however, since the only way to get oxygen into the bloodstream so that it can be absorbed by the muscles is through the lungs.

然而，这样的水对提高身体机能毫无用处，因为只有通过肺部才能将氧气吸入血液，从而被肌肉吸收。

4·If I can only find a form by asking for it on a forum, the form is practically useless to me.

如果我只能通过到论坛中提问才能找到某个表单，那它对我来说几乎毫无用处。

5·Conquerors know that action is in itself useless.

征服者们知道行为本身毫无用处。

无益

1·Having ambitious and well-defined goals is important, but it is useless to think about them much.

有野心，有明确的目标是很重要，但总是考虑这些是无益的。

2·My reasons are that I consider all judging not only useless, but immoral.

理由就是，我认为一切审判不仅无益，而且是不道德的。

3·It was time for me to start living with discomfort and be under pressure (by the way there is a difference between GOOD pressure and the pressure from useless stress).

是时候开始不舒适的生活、面临压力了(顺便说一下，“好”的压力和来自无益紧张的压力是有区别的)。

4·Any of your attempts to stop evacuation will be useless.

而你的任何一种企图停止撤退将是无益的。

5·The former regulation is set aside because it was weak and useless

18先前的条例，因软弱无益，所以废掉了

没有用处

1·This basically made the entity management useless for us.

这使得实体管理对于我们基本上没有用处。

2·A truly secure program would have no inputs, but that program would be useless.

真正“安全”的程序应该没有任何输入，但那种程序是没有用处的。

3·Legs on snakes likely disturbed some form of movement, such as burrowing, rendering the legs useless.

蛇的腿可能打扰了它的某些活动，比如，掘穴，逐渐就表现的没有用处了。

4·Knowledge and intelligence are both useless without action. It's as simple as that.

同样简单的是，没有行动，知识和才智都是没有用处的。

5·Now I know that he just wanted to get rid of some useless books and make some money.

现在我明白了，他不过是想把一些没有用处的书处理掉，赚点钱。

无效的

1·The uploaded data may be useless without this meta information.

没有这个元信息，上载的数据可能会无效。

2·If speed is now supposedly the issue, then the patience of user's when faced with poor or useless descriptive text for indexable pages will also surely become a factor.

如果我们现在认为速度是最主要的问题，那么用户对索引页面上无效说明的忍耐力也将成为影响用户体验的因素。

3·To others, dreams denote night-time learning or problem-solving, even automatic sifting of the mind's detritus, the skimming off of useless information to be dumped like so much mental junk.

其他人认为梦表示夜间学习或解决问题的过程，甚至是思想碎片的自动筛选过程，像清除思想垃圾一样清除无效信息。

4·Last year the reimbursement rate was cut for 150 medicines judged, in effect, useless.

去年，卫生部降低了150种被证明无效药物的报销率。

5·When escape seems useless, they tend to go to extremes by killing the victim directly.

当逃逸无效的情况下, 他们采取了更加极端的方式, 就是直接剥夺受害者的生命.

没用了

1·Tears now are useless.

现在流眼泪也没用了。

2·“Why, aren't we all aware, you'll never see a swallow in the air till spring insight! So now,”thinks prodigal,“my fur is useless quite. Why wrap oneself in furs?

“谁不知道只有到了春天,天空才会出现燕子呢,”浪子想，“所以，现在我的皮大衣没用了，为何还要紧裹着它呢？

3·Then he found that Franklin was useless.

那么，他就发现富兰克林没用了。

4·The monkey become more and more useless. Sha Seng, lend my glasses to him.

这猴子越来越没用了。沙僧，把我的眼镜借他一用。

5·Look, whether she meant to insult me is immaterial. She DID insult me. Anything you say now is useless.

听着！她有没有想侮辱我并不重要，事实是她的确侮辱了我。现在你说什么都没用了。

没什么用

1·Without mkuser, the rest of the commands are useless.

如果没有mkuser，其他命令都没什么用。

2·That made Android handsets relatively useless for business users.

这使得Android手机对于商务用户来说没什么用。

3·Even if investigators were to find the wreckage and recover the cockpit voice recorder, it would prove useless, he said.

他说即便调查人员找到飞机残骸，恢复驾驶舱内的录音，也会证明没什么用。