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His car does 35 miles per gallon of petrol．他的车1加仑汽油可以跑35英里。
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These apples cost 30 cents a pound．这种苹果3角钱一磅。
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He earns two rupees a day collecting rags and scrap paper．他靠捡破布和废纸每天挣两个卢比。
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In Indonesia there are 18,100 people per doctor．在印度尼西亚18100人才有一名医生。
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The average cereal consumption per head per year in the U.S.A is 900 kg．美国每年每人的平均谷物消费量为900公斤。
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602 media—medium
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media是medium的复数形式，常加定冠词，表示“传播媒介”或“媒体”：
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Radio, television, newspapers and magazines are known as the mass media．广播、电视、报纸、杂志都可称为公众传播媒介。
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The media are covering the presidential election thoroughly．媒体正细致地报道总统选举。
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I don’t think we will want to say anything to the media．我想我们没想向媒体说什么。
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1704946502
the media后面虽说应用复数动词，但有些人愿用单数动词：
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The media have generally refrained from comment．传媒一般都未作评论。
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The media is (are) to blame for starting the rumours．引起这些谣言得怪媒体。
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medium还可有一些别的意思，如“媒介物”、“介体”：
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The atmosphere is a medium for sound waves．大气是声波的媒介物。
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Copper is a good medium for the conduction of heat and electricity．铜是热和电的良导体。
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Most bacteria grow best in slightly acid medium．多数细菌在略带酸性的介质中生长最好。
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还可表示手段、方式、艺术形式：
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Television can be an excellent medium for education．电视可以是极好的教育手段。
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Oil paints and water colours are mediums for the creation of works of art．油画和水彩都是创造画作的方式。
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He writes stories, but the theatre is his favourite medium．他也写故事，但他最喜欢的艺术形式是戏剧。
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还可用作形容词，表示“中等的”：
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The boy is of medium height．这小伙子是中等身材。
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a medium-sized firm 中等大小的公司
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