He rarely exercises and only sleeps eight hours a day.
eight hours
I slept less than eight hours last night. 我昨天晚上睡觉不到八小时
翻译如下： He seldom takes exercise and only sleeps less than 8 hours a night. 他很少运动 ， 每晚睡眠不足8 小时。
eight hours 或者是8-hour也可以，区别在于后者有个破折号
For students ,sleeping less than 8 hours every day is unhealthy.
How long do you sleep everyday?around eight hours
For students, it's unhealthy to sleep less than 8 hours everyday.
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