人们早已知道，如果材料的表面积足够大，可引起催化反应。It had been known for some time that chemical reactions can be catalyzed by materials with large surface areas.它们对被它们催化的反应有很强的专一性.They are highly specific for the reactions that they catalyze.在...
He picked up a pencil and toyed with it idly.他捡起一支铅笔，无所事事地摆弄着。He toyed with the idea of going to China.他动过去中国的念头，但并没当真。While he was talking to his secretary, he toyed with a pencil.在和秘书谈话的时候, 他手中摆弄着一支铅笔....
I think you ought to give football a rest for a time.我认为你应该暂时停止踢足球。Things were pretty grim for a time.事情一度糟糕透了。After reflecting for a time he decided not to go.思考了一会儿以后,他决定不去了....
Although basically an engine hood AOL continues to include certain differences.尽管从根本上说,IE是 AOL的默认浏览器,但它包含不同的种类.Go to a site like Yahoo! Finance and enter 'AOL' in the Get Quotes field.登录诸如“雅虎财经”这样的站点，在“股票行情”栏输入...
令人疑惑的是，她看上去就像一位面熟的邻家阿姨或是祖母。She looks disconcertingly like a familiar aunt or grandmother.她总是在为她不方便外出的祖母跑前跑后。She was forever running errands for her housebound grandmother.我们屏住呼吸听祖母讲述她的游历故事。We listened with bated breath t...
Fortunately for me, my friend saw that something was seriously wrong.对我来说幸运的是，我的朋友发现了非常严重的错误。Fortunately, the chore of leaf sweeping is well worth the effort.幸运的是，干清扫落叶这个活儿是值得的。Fortunately, such cowboy firms are becoming...