蓝牙系统通话状态中，单按取消键（Cancel-key），即可挂断电话，语音提示“电话已 挂机”。
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cancel key 清洗键 ; 消除键 ; [计] 清除键 ; 符号取消键
ck cancel key 删除键
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The Key itself is cancelled by invoking its cancel method.
通过调用Key的cancel方法将Key本身取消。
youdao
This key exchange security method duplicates an existing one. Either modify it, or cancel this dialog.
此密钥交换安全措施与现有的重复。请更改它，或取消此对话框。
Bad weather prompted some New Zealand planners to cancel outdoor events, but a low-key fireworks display went ahead at Auckland's Sky Tower.
BBC: New Year's Eve 2012: Celebrations around the world
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