副词
中文翻译：偷偷地
同义词：
['secretly', 'surreptitiously']
例句：
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1.She sneaked into the room without anyone noticing.
她悄悄地溜进了房间。
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2.He sneaked out of the house during the night.
他在夜里悄悄溜出了房子。
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3.They sneaked in through the back door without being seen.
他们从后门悄悄进来了，没有被发现。