杰克：每三小时醒一次？为什么？
杰克：每三小时醒一次？
他每三小时醒来一次。——11点、2点和5点各一次。
每三小时(每小时中间都有10分钟休息)休息一段更长的时间。
Never work more than three hours (with ten minute breaks) before taking significant time off.
弗雷德里加说，这些汽车以最高36英里每小时（60公里每小时）的速度行驶，每开两到三小时就需要充电八小时。
The vehicles ran at maximum speeds of 38 miles per hour (60 kilometers per hour) and had to be recharged for eight hours after every two to three hours of driving.
荧光灯使用寿命的确定方法是：每关闭20分钟后打开三小时。
Lamp life for fluorescent lights is determined by testing three hours on for every 20 minutes off.
荧光灯使用寿命的确定方法是：每关闭20分钟后打开三小时。
Lamp life for fluorescent lights is determined by testing three hours on for every 20 minutes off.
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