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BNC: 15901 COCA: 5476

B2 [ C or U ] (someone or something that provides) support or help, or something that you have arranged in case your main plans, equipment, etc. go wrong後備人員;候補物,替代物,備用物

We're going to need some professional backup for this project.要完成這項工程我們需要一些專業人員的支持。
The party is going to be outdoors, so we'll need to organize somewhere as a backup in case it rains.晚會將在露天舉行,所以我們需要安排一個備用的地方以防下雨。
Remember, your colleagues are your backup system when things go wrong.記住,一旦出了差錯,你的同事就是你的後援。

B2 [ C ] a copy of information held on a computer that is stored separately from the computer(文件的)備份

Before we leave work each day, we make a backup of all the records we have entered into the computer that day.每天下班之前,我們都把當天輸入計算機的信息進行備份。
The department's backup disks are all stored in a different building.該部門的備份磁盤都存放在另一棟大樓内。

[ C ] US a player who plays when the person who usually plays is not available替補隊員

He's a backup for the Dallas Cowboys.他是達拉斯牛仔隊的替補隊員。

More examples

The paramedic who arrived first at the scene immediately called for backup.

How can I run the pub on my own all evening without any backup?

It is essential to have backup when you go diving, in case anything goes wrong.

If we run out of sandwiches I've got some pizzas in the kitchen as backup.

My neighbour came along to provide some backup, in case the youths gave me any trouble.

supporting the main singer, performer, etc. 伴奏的;伴唱的

backup vocals伴唱
Beyoncé's backup dancers爲碧昂絲伴舞的舞者
BNC: 15901 COCA: 5476
BNC: 15901 COCA: 5476
backup noun
help
BNC: 15901 COCA: 5476

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