I slept for nine hours last night.
我昨晚睡了九个小时。
I sleep for nine hours every night.
我每天晚上睡九个小时。
整整9个小时。
She slept for nine hours, but she was still tired. (3)
他已经睡了九个小时，但还是很累。
So maybe I have one healthy habit. I sleep for nine hours every night.
因此，或许我不太健康，尽管我有一个健康的习惯。
Block out eight or nine hours for sleep every night.
每晚为你的睡眠规划好8到9个小时。
Imagine what nine hours a night could do for the high school football team?
想像9个小时一晚上可以为高中足球队做什么？
Frankly, no one can study for 10-11 hours everyday nine months in advance.
坦白说，没有人可以在预先九个月内每天持续学习10到11小时。
He has been doing that work for more than nine hours.
那个工作他已经干了九个小时了。
He has been doing that work for more than nine hours.
那个工作他已经干了九个小时了。
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