Pathological changes of the heart can be observed from the tongue.
若心有病变,可以从舌上反映出来。
These showers can be so extensive; that they can easily be observed from the ground.
这些簇射的范围非常广,在地面上都能较容易地观察到。
The distinction only matters if a single event will be observed from multiple places in the document tree.
只有需要从文档树中的多个位置观测一个事件时才会造成区别。
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