副词
中文翻译：偷偷地
同义词：
['secretly', 'surreptitiously']
例句：
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1.They sneaked into the room without anyone noticing.
他们悄悄地进入了房间，没有人注意到。
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2. She furtively slipped out of the house before dawn.
她秘密地在黎明前溜出了房子。
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3. The thief was caught furtively by the police.
这个小偷被警察秘密地抓住了。