n.后備
When the main system fails, the backup system take over. 當(dāng)主系統(tǒng)不能工作時(shí),后備系統(tǒng)立即投入工作代替之。
The backup job resides on the primary server. 備份作業(yè)駐留在主服務(wù)器上。
n.備份