例句： You should make a copy of the disk as a backup. 你应该将磁盘复制一个备份。 The police had backup from the army. 警方得到了军方的增援。 Every part of the system has a backup. 这套系统的每个部分都有备件。 Sharon also sang backup for Barry Manilow. 莎伦还为巴里·马尼洛唱了伴唱。 We can use him as a backup if one of the other players drops out. 如果有参赛者退出，我们可以用他作为替补。 上一篇：宜宾大学城将有哪些大学要来 下一篇：drink是可数名词还是不可数名词? |