By 11.30am however the level dropped dramatically, and mysteriously, to about 6msv per hour and the workers were back to the job.

然而到了早上11点30分，奇怪的是核物质浓度大幅下降到了6毫希每小时，工作人员各自回到了岗位上。

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Through the summer, and as fall began to deteriorate into winter, I would devote about an hour per day to my little job.

整个夏天过去了，随着秋天开始渐渐退去，冬天来了，每天我要把大约一小时时间用在这个差使上。

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Pointing and focusing a laser beam on a target that is rocketing skyward at thousands of miles per hour is no easy task, but the Airborne laser is uniquely able to do the job.

对于飞行速度每小时数千英里的目标进行激光束瞄准和聚焦并不容易，但机载激光器是唯一能够完成这项工作。

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And Christiana Stoddard and Peter Kuhn (2008) found that, since 1983, teacher on-the-job hours have increased by roughly one hour per week, while after school time devoted to work has jumped by 34%.

FORBES: Why US education deserves our praise (and funding)