Use approved step stools and ladders.
使用稳固可靠的凳子和梯子。
The step stools we just finished a few days ago?
这张台阶凳我们几天前才做好的？
The tops of the foldable step stools have white polka dots and were sold as a set of two, including 9-inch and 15-inch stools.
折叠梯凳的顶部带有白色的圆点，并且是以两个一套售出的，包括9英寸的和15英寸的凳子。
The tops of the foldable step stools have white polka dots and were sold as a set of two, including 9-inch and 15-inch stools.
折叠梯凳的顶部带有白色的圆点，并且是以两个一套售出的，包括9英寸的和15英寸的凳子。
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