He will be under observation for a period of time.
他将被留做观察一段时间。
There were same period of the treatment and observation in two groups.
两组患者接受治疗和观察的时间相同。
We can hold to period of time again, observation observation.
我们可以再坚持一段时间，观察观察。
We can hold to period of time again, observation observation.
我们可以再坚持一段时间，观察观察。
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