物质基础，至少应该把一只脚以后前后这个基地的宽度墙。
The foundation material should extend at least one foot beyond the front and back of the base width of the wall.
站在你的脚肩宽度分开。
站立的时候保持你的双脚间有肩膀的宽度，而且让膝盖和脚朝前。
Stand with feet shoulder-width apart and knees and feet facing forward.
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