本帖最后由 goulaobangzi 于 2015-5-29 10:53 编辑 这款GravityLight配有数个滑轮以及精心设计的动力系统做功,同时配以怀旧风格的配重轮,利用重力来进行发电。GravityLight的整个发电过程是这样的,将 ...
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