楼梯的所有部件应光滑、圆润，没有突出的、尖锐的部分，以免对使用者造成无意的伤害。
All component Ying Guang of stair is slippery, fruity, did not highlight, acerb part, the person that lest be opposite, use is caused innocently harm.
楼梯的所有部件应光滑、圆润，没有突出的、尖锐的部分，以免对使用者造成无意的伤害。
All component Ying Guang of stair is slippery, fruity, did not highlight, acerb part, the person that lest be opposite, use is caused innocently harm.
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