The battery charges thru regenerative braking and thru stationary bicycling .

其电池靠再生式刹车和固定式自行车运动来充电。

Specification for helmets used in recreational bicycling or roller skating .

娱乐性自行车运动或滚轴滑冰用防护帽的规范。

My brother usually goes bicycling twice a week .

我弟弟通常一周两次骑脚踏车兜风。

She goes bicycling twice a week .

她一星期进行两次自行车运动。

One or two others are bicycling from the direction of the boma , the administrative centre .

另外有一两个人骑着自行车从博玛（boma）行政中心的方向过来。