From an experimental point of view, it is certainly never observed.
从实验的角度来看，这种情况从未被观测到。
This point has often been observed upon.
这一点是人们时常谈论到的。
Change of every index at different time point was observed.
观察不同时间点各指标的变化。
The main point is that, the stress is the prevailing reason for the symptoms observed.
主要的观点是，压力是观察到的症状的主要原因。
This point has often been observed on.
这一点是人们时常谈论到的。
This point has often been observed on.
这一点是人们时常谈论到的。
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