鱼和其他食肉动物的体内会积累大量的化学物质。
The bodies of fish and other meat-eaters can build up high levels of the chemicals.
“当沙丁鱼运行，它们带来海豹，海豚，和其他食肉动物”，他写道。
"When the sardines run, they bring seals, dolphins, and other predators," he writes.
人类需要使用工具，因为他们没有像其他食肉动物如狮子和老虎那样锋利的牙齿。
Human beings needed to use tools because they did not have sharp teeth like other meat-eating animals, such as lions and tigers.
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