spare bit

• 备用位

spare bit的用法和样例：

例句

1. The surgeon could see Mr Huckvale was struggling to stand and told him he had a spare leg lying under the desk in his surgery in America - and he could have it for nothing.
   这位外科医师可能见到哈克瓦尔正努力要站起来，所以告诉他，他把一条备用义腿放在美国门诊室内的办公桌底下，而且可以让他免费安装。