But I find it is a very hard job, because if you give it up one day, all effort you have done in many days before may be useless.
但是，我发现它是一个非常难的事情，因为如果你有一天放弃了，意味前面好多天所做的努力都白费了。
Moreover, secondhand goods transactions make it possible for people to make good use of the goods which may be useless in their hands.
其次，二手商品交易使人们能好好利用在他们手上没有用处的东西。
When members will get 500 gold or honorary member of the title, must not look down upon this money. 500 gold in these days may be useless.
届时会员们将会获得500金币或者荣誉会员的称号，千万别小看这点钱哦。500金币在这几天也许没用。
Given that many readers of self-help books that encourage positive self-statements are likely to suffer from low self-esteem, they may be worse than useless.
鉴于许多自助书籍的读者本身就饱受自信不足的折磨，一味地鼓励他们形成积极的自我评价只能是有害无益。
It may seem that inversion lists are useless for regular data, but in fact they can be easily extended to handle regular data.
表面看来，倒排表并不适合用于规则数据，但是实际上它很容易扩展用以处理规则数据。
However, the major disadvantage of a stub class is that the slightest change of a web service definition may be enough to render a stub class useless, in this case, the stub class must be regenerated.
然而，存根类主要的不足之处在于即使是对Web服务定义做很小的变动也会造成存根类无法使用，这时存根类必须重建。
Loot containers you find out in the wasteland. You may find some items useless but they can be sold! Sometimes you can find some really useful things too.
在废土中搜寻每个容器。你可以找到一些无用的物品，但他们可以出售！有时你也可以找到一些真正有用的东西。
Similarly, scholars and researchers must be given the freedom to choose their own areas of study, no matter how offbeat or seemingly useless those areas may be.
相类似地，学者和研究人员必须被赋予去选择他们自己研究领域的自由，无论那些领域可能是多么的怪异或似乎毫无用处。
Books in the library may be outdated, giving you useless information.
在图书馆的书籍上学会的可能是过时的，给你无用的信息。
It is scientifically useless to refer to a source that readers may not be able to find or where they find something else than the authors did when they wrote their article.
参考那些读者可能不能找到或者他们找到其他一些资源而非作者在写文章时所引用的资源在科学上是无用的。
That means it would be useless for cooling things like chocolate milk and frozen pizzas, but its designers say it may have other USES - like, say, creating faster computers.
这意味着它会像巧克力牛奶的冷却和冷冻比萨东西没用，但它的设计者说，它可能有其他的用途-例如，说，创造更快的计算机。
For example, after the completion of some activity, it may be discovered that some quality flaw renders the work useless.
例如，当某些工作实现后，有时会发明因为存在品质缺陷而使得产品毫无用途。
For example, after the completion of some activity, it may be discovered that some quality flaw renders the work useless.
例如，当某些工作实现后，有时会发明因为存在品质缺陷而使得产品毫无用途。
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