in the dark, in the rain, in the distance, in the middle (of), in the end, on the whole, by the way, go to the theatre III、零冠词: 1、零冠词的基本用法:一般性的泛指,甚至表抽象意义。 2、复数可数名词、不可数名词前不用冠词,表示泛指; 如:Horses are usef...
1. at 表示“以……速度”“以……价格”。 It flies at about 900 kilometers an hour. 它以每小时900公里的速度飞行。 I sold my car at a high price. 我以高价出售了我的汽车。 2. for 表示“用……交换,以……为代价”。 He sold his car for 500 dollars. 他以...
2、表示计量的介词: at, for, by 1. at表示“以……速度”“以……价格”。 It flies at about 900 kilometers an hour. 它以每小时900公里的速度飞行。 I sold my car at a high price. 我以高价出售了我的汽车。 2. for表示“用……交换,以……为代价”。 He sold h...
1.表示“标准或单位”的介词:at, for, by (1)at表示“以……速度”“以……价格” He drove at a speed of 80 miles an hour.他以每小时8英里的速度行驶。 I sold my car at a high price.我以高价出售了我的汽车。 (2)for用……交换 I bought it for 20 dollars.买它...
Among the annoying challenges facing the middle class is one that will probably go unmentioned in the next presidential campaign: What happens when the robots come for their jobs? Don‘t dismiss that possibility entirely。 About half of U.S。 jobs ...
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