鲑鱼会游到河的上游去找寻产卵的地方。而枝双腔吸虫则会钻到蚂蚁的大脑里，操控蚂蚁的大脑，驱赶着蚂蚁爬到草尖上。

So, salmon swim upstream to get to their spawning grounds, and lancet flukes commandeer a passing ant, crawl into its brain, and drive it up a blade of grass like an all-terrain vehicle.

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这是一种枝双腔吸虫(lancet fluke)，它是一种很小的活在大脑里的虫子，一种大脑的寄生虫，它必须要进入到绵羊或奶牛的肚子里才能继续活下去。

It's a lancet fluke: it's a little brain worm — a parasitic brain worm — that has to get into the stomach of a sheep or a cow in order to continue its life cycle.

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