名词
中文翻译：窥视系统
同义词：
['sneak peek', 'secret observation system例句：1. The children love to play in the backyard during their break time.（孩子们喜欢在休息时间在后院玩耍。）']
例句：
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1. The children love to play in the backyard during their break time.
孩子们喜欢在休息时间在后院玩耍。
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2.The teacher used a peek-a-boo system to engage the class.
老师使用了一个偷偷观察系统来吸引全班学生。
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3.The spymaster had devised a clever system to keep his agents in the dark.
间谍头目设计了一个巧妙的系统来让他的特工们保持秘密。