It is easy to perceive the contrast between their material prosperity and the emptiness of their lives.

他们物质富足，但生活空虚，这一差别是容易察觉的。

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So that visitors perceive content as being easy to navigate, the navigation is often structured with blocks of the same height and width.

导航区通常都是具有相同高度和宽度的区块，因此访问者感觉内容能被轻松引导。

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Sub-health is not easy for people to perceive, it is potential, the cause of it owes to the pressure and the unhealthy life style that people face.

亚健康不易为人们所察觉，它是潜在的，亚健康的起因是人们面临的压力和不健康的生活方式。

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