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extension ladder /ɛkstˈɛnʃən ˈladə/ n

中文：伸缩梯

中文 · 伸缩梯Español · escalera extensibleFrançais · échelle coulissante
Meaning：Straight ladder of adjustable height, made up of two superimposed planes that slide one on the other.
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Ladders and steps

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