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关注：1
2013-05-23 12:21
求翻译：12.53. There must be protection at the bottom of the ladder rungs, i.e. in the mirrors, where a projecting part of the foot or hand can contact a dangerous zone.是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
12.53. There must be protection at the bottom of the ladder rungs, i.e. in the mirrors, where a projecting part of the foot or hand can contact a dangerous zone.
问题补充： |
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