Cover, sitting surfaces: Through dyed split leather from cattle, with an embossed and pigmented surface
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sitting surfaces
坐在表面
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Because the two irregular surfaces no longer sit properly on one another, pressing them together tightly (as occurs strongly while sitting) causes pain.
因为他们俩的表面都不规整，所以受到挤压的时候(特别是坐着)，就会疼。
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