名词
中文翻译：秘密性
同义词：
['secretive', 'mysterious', 'concealed']
例句：
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1. The detective was so secretive thatno one knew what he was up to.
侦探非常神秘，没有人知道他在做什么。
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2. Themystery of the disappearance has been asource of fascination for many years.
失踪事件的谜团多年来一直是许多人热衷的话题。
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3. The old mansion is filled with secretsthat have been hidden away for generations.
这座老宅充满了世代相传的秘密。