sill for jump control

例句：

1. 1. The gymnast used a shill to jumphigher.
   体操运动员使用跳台跳得更高。
2. 2. The children were playing on theshill by the river.
   孩子们在河边的跳台上玩耍。
3. 3. The shillwas too short for her to jump over.
   跳台对她来说太短了，她跳不过去。