To move down through the mountain it is important that you go down slowly, thus it becomes a necessity for mountain bikes to use heavy weight materials so as to reduce the speed of the vehicle.
要下移，通过山，重要的是你慢慢下降，由此，成为一种必要的山地自行车使用重的材料，以降低车速的车辆。
To move down through the mountain it is important that you go down slowly, thus it becomes a necessity for mountain bikes to use heavy weight materials so as to reduce the speed of the vehicle.
要下移，通过山，重要的是你慢慢下降，由此，成为一种必要的山地自行车使用重的材料，以降低车速的车辆。
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