useful的反义词有：vain, ineffectual, helpless, useless, futile。adj.useful的反义词（有用的;有益的）：vain, ineffectual, helpless, useless, futile。...

useful的近义词/同义词有：functional, valuable, profitable, practical, advantageous, handy, helpful, beneficial, serviceable, advantageous, good, helpful, effective, expedient, advisable, practical, valuable, beneficial, construct...

In business a poker face can be very useful.生意场上，不动声色会非常有用。"For heaven's sake!" Dot expostulated. "They're cheap and they're useful."“拜托！”多特反驳道，“它们又便宜又管用。”HDTV is especially useful if there are a lot of sp...

There are doubts about the usefulness of these tests.这些试验是否有用，人们有所保留。I was persuaded of the usefulness of his new device.我相信了他的新装置的实用性.The index adds appreciably to the usefulness of the book.索引明显地增加了这本书的实用价值....

n.满屋，一屋子( houseful的名词复数 )...

There was a houseful of guests.宾朋满座.They entertained a houseful of guests.他们款待满屋子的客人.We had a houseful of guests last weekend.上周末我们家来了一屋子客人....

housefuls的音标：...

useful的比较级为：more useful...

useful的最高级为：most useful...

usefully的音标：usefully的英式发音音标为：['ju:sfəlɪ]usefully的美式发音音标为：['jusfəlɪ]...

This provides useful information on the type of occurrences.所有资料提供有关矿床类型的有价值材料.The latter studies are extremely useful to the analyst.后者的这些研究对于分析工作者极为有用.Combinatorial Theory is exceptionally useful in the real world.组合论在...

houseful的复数形式为：housefuls...

usefulness的音标：usefulness的英式发音音标为：['ju:sfəlnəs]usefulness的美式发音音标为：['jusfəlnɪs]...

adj.有用的，有益的，有帮助的，令人满意的...

There are cartloads and housefuls of books about English verb tenses as yet.迄今,关于英语动词时态的论著可谓汗牛充栋....

n.有用，有益，有效，效能...

houseful的音标：houseful的英式发音音标为：['haʊsfʊl]houseful的美式发音音标为：['haʊsfʊl]...

useful的音标：useful的英式发音音标为：['ju:sfl]useful的美式发音音标为：['jusfəl]...

We need to find ways of dealing creatively and usefully with our feelings.我们需要找到一些既有创意又实用的方法来调整我们的情绪。We can usefully distinguish between four main kinds of international economic integration.我们可以区分四种主要的国际经济一体化.In some ca...

Usefulness includes the fact the negatives have been calibrated.所谓有用,是指在底片上要有标度.The theory is of limited usefulness.这个理论用途有限。The report is of potential usefulness to the government.这个报告可能对政府有用。There are doubts about the ...

n.满屋，一屋子...

We need to find ways of dealing creatively and usefully with our feelings.我们需要找到一些既有创意又实用的方法来调整我们的情绪。In some cases the slag can be disposed of usefully.有时炉渣能有用处.We can usefully distinguish between four main kinds of inte...

adv.有用地，有效地...