提供安装在自行车上的风扇及其传动机构，用于给骑车者提供风力和降温。
To provide the fan installed on the bicycle and its transmission mechanism, used to provide wind and temperature cycling.
提供安装在自行车上的风扇及其传动机构，用于给骑车者提供风力和降温。
To provide the fan installed on the bicycle and its transmission mechanism, used to provide wind and temperature cycling.
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