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英语翻译Last summer,Transportation Secretary Elizabeth Dole anno

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英语翻译
Last summer,Transportation Secretary Elizabeth Dole announced a new rule:Unless states representing two-thirds of the country’s population pass compulsory (强制性的) seat-belt-use laws by April 1989,all new vehicles will have to be fitted with air bags or automatic seat belts.
这一句中的Unless states representing啥意思呢?
I’m only going a few blocks.Yet 80 percent of accidents happen at speeds or less that 25 miles per hour,75 percent happen within 25 miles of home.这句又何解呢?
I’m only going a few blocks.Yet 80 percent of accidents happen at speeds or less that 25 miles per hour,75 percent happen within 25 miles of home.
我只去几个块.事故的80%发生以速度或那25英哩每小时,75%发生在25英哩家内.
Unless states representing
除非状态代表