门户网站试图创建他们所谓的粘性内容，以尽可能长时间地留住用户。

Portals attempt to create what they call sticky content to keep a user as long as possible.

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密封带有良好的耐候性，且长时间不失去粘性和机械强度。

E. seal with good weather resistance, and long time not lose viscosity and mechanical strength.

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压缩项和粘性项的影响则随时间的不同而不同。

Effect of compressible term and that of viscous term are different in different time.

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