动词
中文翻译：监视
同义词：
['survey', 'spy on', 'monitor']
例句：
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1. The police are still trying to figure out who stole the valuable paintings.
警方仍在试图找出是谁偷走了这些珍贵的画作。
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2. He spied on his neighbor's house while they were away on vacation.
他在他们度假时偷偷观察了邻居的房子。
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3. The spy was able to gather vital information from the enemy's agents.
间谍成功地从敌方特工那里收集到了关键信息。