词典释义：
pl-n. 活梯；凳梯；（stepladder的复数）
Only one person shall be allowed on a ladder at a time except for stepladders that are equipped with steps on both sides. (Rungs are not considered steps.)
梯上一次只能有一个人，两面有梯阶的活梯除外。(横档不能作为梯阶)。
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