為何腳踏車得座墊都是黑色的 輪胎是黑的我覺的還好 可是座墊可以有不同的顏色阿？
我提出以下的想法
太陽能板 ＋LED/EL + 無線遙控 作成的遙控發光（指示功能）的座墊 讓你在夜間好找你的腳踏車
另一個是可以更換的有顏色的腳踏車座墊套
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