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Winter to spring, with the summer approaching, the owners began to consider how to fit for themselves with a suitable cool cushion.
冬去春来，随着夏季的临近，车主们开始考虑如何为自己配一套合适的清凉坐垫了。
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The elastic support can be a spiral spring, a plate spring or an elastic cushion;
所述的弹性支承可为螺旋弹簧、 板弹簧或弹性垫层；
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