keep someone under observation
... keep two faces under one hood 耍两面手法 keep under someone's feet 妨碍某人 keep someone under observation 观察某人,监视某人...
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1 ... keep somebody alive使 活着 keep the environment clean保持环境清洁 key要点，关键，钥匙 ...
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keep someone under observation
对某人进行观察
以上为机器翻译结果，长、整句建议使用 人工翻译 。