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metal step ladder: [1](4s)：adjust position;[2](27s)：climbing steps;[3](15s)：descending steps下载 收藏梯子(ladder)x1倍举报
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wooden step ladder: [1](2s)：open;[2](15s)：close and set down;[3](2s)：set down;[4](8s)：adjust position;[5](30s)：open and climb up and down steps下载 收藏梯子(ladder)x1倍举报
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metal step ladder: [1](4s)：open;[2](4s)：open and set down;[3](5s)：open and set down;[4](6s)：close;[5](6s)：slide closed and set down下载 收藏梯子(ladder)x1倍举报
