His assistant stepped into the breach when the old surgeon was unable to go on with the operation.

当那位老外科医生不能继续动手术时，他的助手接替他将手术进行了下去。

youdao

His assistant stepped into the breach when the old surgeon was unable to go on with the operation.

当那位老外科医生不能继续动手术时，他的助手接替他将手术进行了下去。

youdao