spring-board造句

例句与造句

1. A sharp tool, or bit, was hung from a rope and jerked up and down by men jumping on a spring-board .
   粗绳子上挂着锐利的工具，即钻头，由踏板上跳跃的人把它拉起又放下。
2. It's difficult to find spring-board in a sentence. 用spring-board造句挺难的