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| NOUN |
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| /ˈstændbaɪ/ |
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| | someone or something that is always available to be used if it is needed in a particular situation 备用的人（或物） | a standby diesel generator 备用的柴油发电机 | | We’ ve kept the old buggy as a standby in case the new one breaks. 我们把旧汽车当作备用，以防新车坏了。 | |
| PHRASE |
| - | on standby
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| 1 | available to be used if it is needed in a particular situation 待命；随时准备着 | The troops are on standby and can return at a moment’ s notice. 军队正在待命，一经通知就可以返回。 | | put/place sb/sth on standby Falconer has been put on standby for the European Championships. 福尔克纳随时准备参加欧洲锦标赛。 | |
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| 2 | ready to get on a plane if there is a seat left when it is about to take off （飞机乘客）候补的，等退票的 | passengers on standby 等退票的乘客 | | put sb on standby The flight is sold out, but we can put you on standby. 这个航班已经售完，但我们可以让你等退票。 | |
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| 3 | used about a piece of electrical equipment , for example a television , that is switched on but not in use （电器等的）待机状态 |
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