Some doctors work for 72-hour without sleep.为什么72-hour是错的?

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Somedoctorsworkfor72-hourwithoutsleep.为什么72-hour是错的?Somedoctorsworkfor72-hourwithoutsleep.为什么72-hour

Some doctors work for 72-hour without sleep.为什么72-hour是错的?
Some doctors work for 72-hour without sleep.为什么72-hour是错的?

Some doctors work for 72-hour without sleep.为什么72-hour是错的?
因为72和hour之间加连字符72-hour就变成了形容词,而这句话里介词for后需要跟名词.所以要改成72 hours
例如:
a five-hour tour 五小时的行程