根据美国汽车工程学会（SAE）对腿部进出空间的定义，结合主观评价方法，提出了一种优化设计方法，可有效控制乘员上下车方便性。%According to the Society of Automotive Engineers'(SAE) definition of leg turnover clearance ,this article proposes a optimization design method combined with the subjective evaluations ,which effectively controls passenger's convenience of getting on and off .
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