A reserve or substitute.

• 改变或替代

A reserve or substitute.的用法和样例：

例句

1. Log shipping can be a supplement or an alternative to database mirroring.
   日志传送可以用于补充或替代数据库镜像。
2. Interventional ultrasound may serve as an adjunct or alternative treatment for disrupting thrombi.
   作为一种附助或替代的血栓消融方法超声介入治疗有着良好的应用前景。