He remained clinging convulsively to the ladder and feeling so limp that he was unable to go down any further for several minutes . 他抽筋似地紧抱着梯子,四肢瘫软,好几分钟都不能再往下爬一步。
Before or when using ladders , or working at heights 使用梯子或高空工作前或期间
She was badly hurt when she fell from the ladder 她从梯子上跌下来,伤得很厉害。