Contacts of the children are under surveillance and all remain healthy.
正在对这些儿童的接触者进行监测，并且他们目前仍然都健康。
He was arrested after being kept under constant surveillance.
他在被连续监视之后给逮捕了。
After the surgery, he had to be under constant surveillance.
在手术之后，这个病人随时必须有特别护理。
After the surgery, he had to be under constant surveillance.
在手术之后，这个病人随时必须有特别护理。
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