pad stone

• 垫石

pad stone的用法和样例：

例句

1. Both ends of the pebbled track can be set for balancing.Once the ropes are removed, the pad can be used as a stepping stone.
   绳子可以取下做踏越的垫石，结合游戏万象系列的设备游戏，增加许多乐趣与玩法。