A hugely successful fish in evolutionary terms, with a lineage dating back more than 400 million years, the shark is under relentless attack from humans themselves.
从生物进化角度来说，鲨鱼是成功的物种，在地球上已经繁衍了4亿年。即便如此，鲨鱼仍然不断受到来自人类的袭击。
The alternative view, that evolutionary changes tick along gradually, suggests mutations would accumulate incrementally as time goes by, independently of how many new species a lineage spins off.
与此相对应，认为进化上的改变是渐进式的观点认为突变是随着时间的流逝而不断积累的，这一过程同一支世系衍生出新物种的多少无关。
The alternative view, that evolutionary changes tick along gradually, suggests mutations would accumulate incrementally as time goes by, independently of how many new species a lineage spins off.
与此相对应，认为进化上的改变是渐进式的观点认为突变是随着时间的流逝而不断积累的，这一过程同一支世系衍生出新物种的多少无关。
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