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像瓶口一樣嚴密。形容說話謹慎，不輕易洩漏秘密。
出自宋·周密《齊東野語》。
「她守口如瓶，從不洩漏別人的秘密。」
Data source: Ministry of Education Idiom Dictionary (data.gov.tw, OGDL). For reference only.
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