Cover the strong box safely, then sit on the lid and laugh.
把箱子安全地盖上，然后坐在盖子上大笑。
Working safely requires you to make conscious decisions about how you sit, stand, lift, and almost every thing that you do.
安全的工作需要你有意识的思考你怎么坐，站，抬和你所要做的一切行为。
The runway is not long enough for a jet liner to sit down on safely.
这条跑道不够长，喷气客机不能安全降落。
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