you may push the break a lot, waste the potential energy
下山 save a little, but cannot compensate all,because
所有跟帖:
• 那就坚持上山不踩油门,下山不踩不踩刹车~ -满地找牙- ♂ (0 bytes) () 08/16/2011 postreply 13:16:24
• 或者上山推车,下山拉车 -瞎走瞎拍- ♂ (0 bytes) () 08/16/2011 postreply 13:18:30