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- The attributes reduction of Rough Set is NP problem, and it makes Rough Set hard to use broadly in reality. 摘要粗糙集的属性约简属于NP问题，这就使得粗糙集很难在现实中得到广泛的应用。
- The glue had set hard. 胶粘得很紧。
- He knew that he must stand up to be introduced,and he struggled painfully to his feet,where he stood with trousers bagging at the knees,his arms loose- hanging and ludicrous,his face set hard for the impending ordeal. 他知道自己得起立接受介绍，便笨拙地站起身子。此时他的裤子膝部鼓了起来，两臂也可笑地松垂，板起了面孔准备迎接即将到来的考验。
- He knew that he must stand up to be introduced, and he struggled painfully to his feet, where he stood with trousers bagging at the knees, his arms loose- hanging and ludicrous, his face set hard for the impending ordeal. 他知道自己得起立接受介绍，便笨拙地站起身子。 此时他的裤子膝部鼓了起来，两臂也可笑地松垂，板起了面孔准备迎接即将到来的考验。
- Outside, Natalie pulls the handkerchief off an almost unchanged face; sharper, paler still beautiful, the mouth thinner, the jaw set harder. 一到外面，娜塔丽就拉下手帕，露出了一张几乎没变样的脸；更瘦削、更苍白，仍然很美，嘴唇显得更薄，下巴显得更坚定。
- It is now our aim to set up a factory. 我们现在的目的是创办一座工厂。
- Nothing in the world is too hard to do if we set our minds on it. 世上无难事，只怕有心人。
- She had the sapphire set in a gold ring. 她把那枚蓝宝石镶在金戒指上了。
- Research worker find it hard to correlate one set with the other. 研究工作者们发现两者之间很难找出联系。
- The judgment set a new precedent. 那次判决树立了一个新的判例。
- A rival company has set afloat a new credit scheme. 一家竞争的公司已开始实施一项新的信用购物方案。
- She bought a set of furniture on easy terms. 她以分期付款的方式买了一套家具。
- The printer can set this additional page in here. 这位印刷工把这额外的一页加在这里。
- A committee was set up to look into the workers' grievances. 成立了一个委员会来调查工人的不满。
- A very nice set of glasses came under the hammer yesterday. 昨天拍卖了一套很精致的玻璃杯。
- I set a high value on his advice. 我认为他的忠告很有价值。
- concrete that sets hard within a few hours. 这种混凝土几小时就凝固。
- A price of $1000 was set on the jewel thief's head. 悬赏1000美元抓住这个珠宝窃贼。
- The clause should be set off by a comma. 这个从句应该用逗号隔开。
- concrete that sets hard within a day. 混凝土在一天内就可以凝固
