事实上，该病毒有可能是知更鸟数量始终没多少变化的原因。

In fact, the virus may be why the once-growing robin population has leveled off.

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不过，与其他人口稠密的大陆不同，总在变化的时间之风似乎越过了非洲，致使其外表在数个世纪乃至数千年间都没多少改变。

However, among all the other populated continents, the all-changing wind of time seems to pass over Africa, leaving its face mainly unchanged for centuries or even millenniums.

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