softground

例句：

1. 1. The new playground ismade of softground.
   新操场是用软地面做的。
2. 2. The softground cushioned theimpact of the fall.
   软地面缓冲了跌落的冲击。
3. 3. The softground made it easyfor her to walk on.
   软地面让她很容易走在上面。