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汉语拼音：bèi yòng

准备着供随时使用：～件。～物资。留出部分现金～。

1. 器用；工具。

   《荀子·儒效》：“设规矩，陈绳墨，便备用，君子不如工人。” 王念孙 《读书杂志·荀子三》：“便备用，犹言备器用耳。”《管子·问》：“问男女有巧技，能利备用者几何人？”

2. 准备着供随时使用。

   清 陈康祺 《郎潜纪闻》卷三：“三鼎甲皆簪金花，外有备用一枝，为总理监事所携归。”《人民日报》1982.3.29：“制定技术政策时，要有多种方案进行比较。确定某种方案后，也还要有多种备用方案。”

• He misplaces his reading glasses with such regularity that aides carry extras.

  他老是记不起把自己阅读时用的放大镜放在什么地方，所以助手们会随身携带备用的。

• He could have taken a spare key.

  他本该带上一把备用钥匙的。

• "Highly inflammable," it says on the spare canister.

  备用罐上写着“高度易燃”。

• The wagons carried spare ammunition.

  大货车载着备用的弹药。

• Every part of the system has a backup.

  系统的每个部分都有备用元件。

• The hospital has an auxiliary power system in case of blackout.

  这家医院装有备用发电系统以防灯火管制.

• Take a spare tire along in case of need.

  带个备用轮胎去,以备不时之需.

• This was sod's law: when the spare tyre is in use, you will have a puncture.

  这真是墨菲法则：一用备用轮胎，保准扎孔。

• The hospital has a backup generator in case there is a power failure.

  医院有备用发电机以防停电.

• The dark green spare bedroom is in total contrast to the lightness of the large main bedroom.

  墨绿色的备用卧室与宽敞明亮的主卧室形成了巨大的反差。

• Adjust, level, light check , fire three, and bracket shots for insurance.

  调整, 对好, 核对光线, 拍三张照, 再照几张备用作为保险.

• On its way to the standing - galley Tilbury's notice got pied.

  提尔伯里的讣告字版送到备用架上的时候,被弄乱了.

• I might need a spare set of clothes.

  我可能需要一套备用的衣服。

• His backup parachute also failed.

  他的备用降落伞也坏了.

• Now he had six reserve coils of line.

  他现在有六卷备用钓索了.