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Collins English-English Dictionary
- zero hour
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1.
n
[military]
the time set for the start of an attack or the initial stage of an operation
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2.
n
[informal]
a critical time, esp at the commencement of an action
Examples
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Zero hour is here; this is it.
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关键时刻到了;这可真是大好时机。
→ zero hour
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零点三十分
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00∶30; zero hour thirty; midnight thirty
→ 零点
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