介词短语
中文翻译：在
同义词：
['behind the scenes', 'under the radar']
例句：
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1.They hid their plans under the cover of darkness.
他们在黑暗中隐藏了他们的计划。
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2.The secret was kept under the cover of secrecy.
秘密被保密地保持了下来。
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3. He moved to a new city under the cover of night.
他在夜晚搬到了一个新的城市。