一旦摆脱了捕食压力，大体型对食草动物来说几乎没有优势。
Once rid of predation pressure, large body size is of little advantage to herbivores.
由于捕食压力，特别是作为取鱼翅的牺牲品，锤头双髻鲨的生存受到威胁。
The scalloped hammerhead is under threat due to fishing pressures and in particular is a victim of shark finning.
一旦摆脱了捕食的压力，巨大的体型对食草动物没有什么好处。
Once free from predation pressure, large body size is of little advantage to herbivores.
加上之前的研究表明，捕食者的出现使被捕食者的压力水平升高，降低了它们的免疫系统机能，使它们更易生病乃至于死亡。
And previous studies have shown that the presence of predators ups stress levels in prey, weakening their immune systems and making them more vulnerable to disease-and death.
一项研究发现如果将老鼠暴露在紫外线下，那些(因为闻到捕食者气味而)承受压力的老鼠8周后产生肿瘤，相比之下，没有压力的老鼠第21周才出现类似情况。
One study found that when mice were exposed to it, those who were stressed (by the smell of a predator) developed tumors at week 8, compared with week 21 in unstressed mice.
一项研究发现如果将老鼠暴露在紫外线下，那些(因为闻到捕食者气味而)承受压力的老鼠8周后产生肿瘤，相比之下，没有压力的老鼠第21周才出现类似情况。
One study found that when mice were exposed to it, those who were stressed (by the smell of a predator) developed tumors at week 8, compared with week 21 in unstressed mice.
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