登山者在大雾中很难辨认方向。
The mountaineers found it hard to orient themselves in the fog.
人们有时很难辨认其他种族的人。
People sometimes have difficulty identifying people of other races.
在某种光照下相对较难辨认的颜色或式样，在另外一种光照下也许相当显眼。
A color or pattern that is relatively indistinct in one kind of light may be quite conspicuous in another.
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