但是该项研究没有搞清楚是否睡眠欠佳即是一种抑郁症状，或者说抑郁症的表现形式就是睡眠欠佳。
However, it's not clear from the study whether sleeping poorly is a symptom of depression, or vice versa.
这种跳跃虽没有明显的动机，但人们猜测它可能是某种沟通或优势地位等社交功能的表现形式。
This type of breach takes place for no apparent reason, although it is speculated that it could have some form of social function of communication or dominance.
虽然其它如硬件之类的领域存在物质表现形式，但软件领域没有。
While other domains such as hardware have a physical presence, software does not.
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