He offered some useful advice.
他提出了一些有益的建议。
Photos make useful teaching aids.
照片可以成为有用的教具。
My mobile phone is extremely useful.
我的手机极为有用。
Overall, this is a very useful book.
总的来说，这是一本很有用的书。
This information could prove useful.
这条信息往后也许有用。
In business a poker face can be very useful.
在生意场上，不露声色会非常有用的。
The research has yielded useful information.
这项研究提供了有用的资料。
I've made some useful contacts in journalism.
我在新闻界结交了一些有用的人。
Videoing students can be a useful teaching exercise.
给学生录像可以成为有用的教学活动。
This technique is useful but it has its limitations.
这种技术实用，但也有局限性。
Some drugs kill off useful bacteria in the user's body.
某些药物会杀死服用者体内的有益细菌。
Hypnotherapy can be useful in helping you give up smoking.
催眠疗法在帮助你戒烟方面可能有用。
The tourist office operates a useful room-finding service.
这个旅游办事处开办了实用的找房业务。
It was a collaboration that produced extremely useful results.
这是一次带来极其有益的成果的合作。
From this chastening experience he learned some useful lessons.
从这次惩戒性的经历中，他得到了一些有用的教训。
The memory expansion cards are useful adjuncts to the computer.
内存扩充卡是计算机很有用的附件。
It was certainly useful to have her there to chauffeur him around.
有她在那儿为他开车肯定是有用的。
The document provided a springboard for a lot of useful discussion.
这份文件引发出许多有益的讨论。
The drug will be useful to hundreds of thousands of infected people.
这种药物将会对成千上万感染者有用。
All of these are useful breeds whose potentiality has not been realized.
所有这些都是有益的品种，其潜力尚未被认识到。
"For heaven's sake!" Dot expostulated. "They're cheap and they're useful."
“看在老天的份上！”多特反驳道。“他们便宜而且他们有用。”
Painkillers are very useful in small amounts to bring your temperature down.
小剂量的止痛药对于降低体温非常有用。
They produced two reports, neither of which contained any useful suggestions.
他们提交了两个报告，都没有任何有用的建议。
The newsletter is a useful channel of communication between teacher and students.
发简讯是沟通师生的有益渠道。
他是个很棒的运动员。
我们也许用得上他。
Having your own computer is very useful.
自己有一台计算机用处很大。
These experiments serve no useful purpose.
这些实验没有任何实际意义。
Extra blank paper will probably come in useful.
额外的空白纸可能用得着。
She has ten years' useful experience behind her.
她有十年的经验，能派上用场。
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