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:
• 那就堅持上山不踩油門,下山不踩不踩刹車~ -滿地找牙- ♂ (0 bytes) () 08/16/2011 postreply 13:16:24
• 或者上山推車,下山拉車 -瞎走瞎拍- ♂ (0 bytes) () 08/16/2011 postreply 13:18:30