The FBI's evidence suggests a lengthy period of observation.

FBI的证据显示是长期的观察起了作用。

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Teeth after root canal therapy must go through a period of observation, after determining no symptoms, to subsequent dental treatment.

根管治疗后的牙齿必须经过一段时间的观察，确定无症状后，才能进行后续的牙齿重建治疗。

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My Chinese friends are more cautious, and tend to award trust more carefully and conditionally only after a period of observation and relationship-building.

我的中国朋友更加谨慎，更愿意先观察一段时间并建立起关系，然后再给予谨慎的、有条件的信任。

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In this valuable and well written account of that period, Josephine Woll spotlights an observation by a Russian writer, Vitaly Troyanovsky.

ECONOMIST: Soviet cinema

We can see things -- we pass over the same portion of the Earth every day, so it's a regular observation that we can make over a long period of time, as well.

WHITEHOUSE: President Obama's call to the International Space Station