n. 后补物，替代物，备用物；支持；阻塞；【计算机】备份。 2.adj. 后补的，副(手)的，替代的，备用的；支持性的；伴奏的(a back pilot 副领航员，助航员)。
the act of providing approval and support; "his vigorous backing of the conservatives got him in trouble with progressives" 同义词：backing, championship, patronage,
(computer science) a copy of a file or directory on a separate storage device; "he made a backup in case the original was accidentally damaged or erased" 同义词：computer backup,
a musical part (vocal or instrumental) that supports or provides background for other musical parts 同义词：accompaniment, musical accompaniment, support,
someone who takes the place of another (as when things get dangerous or difficult); "the star had a stand-in for dangerous scenes"; "we need extra employees for summer fill-ins" 同义词：stand-in, substitute, relief, reliever, backup man, fill-in,
an accumulation caused by clogging or a stoppage; "a traffic backup on the main street"; "he discovered a backup in the toilet"
In information technology, a backup, or the process of backing up, refers to the copying and archiving of computer data so it may be used to restore the original after a data loss event. The verb form is to back up in two words, whereas the noun is backup.
例句与用法
1.
They should have backup details available . 他们要补充自己所知道的细节。
2.
The system includes a backup auxiliary system . 此系统还有一个后备的辅助系统。
3.
It's because they've got all that god stuff for a backup . 因为他们有上帝那一套玩艺儿做精神支柱。
4.
When the main system fails, the backup system take over . 当主系统不能工作时，后备系统立即投入工作代替之。
5.
Small rectangular backup bars were used to fabricate the web-bottom flange connection . 在腹板与下翼缘的施焊中使用小矩形挡板。
6.
The young state secretary found simple procedures for handling the backup of trains . 这位年轻的国务秘书用简单的方法排除了车辆回流的问题。
7.
The bravery would have counted for nothing without the technical backup of arl . 如果没有海军部研究实验室的技术支持，这一勇敢行为也就无足轻重了。
8.
If a mistake is later detected, then we must backtrack to the point of error and try another alternative. this is called backup . 如果以后发现它是错误的，我们必须退回到点，再试另外的选择。这种方法称为回溯。
9.
Throughout the history of gyro testing on servo runs, these timers have proven irreplaceable for backup data behind far more complex timing devices . 从整个伺服运转的陀螺试验过程来看，证明不能用后来更复杂的记时装置代替这种记时器来得到辅助数据。
10.
This backup method is required for the 24x7 environment 24x7环境需要这种备份。
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