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杭州新概念英语培训-312. How it came about that snakes manufactured poison is a mystery.
蛇是怎样产生毒液的,这是一个谜。
313. Over the periods their saliva, a mild, digestive juice like our own,
蛇的唾液本来和我们人的消化液一样柔和,但经过漫长的时间,
314. was converted into a poison that defies analysis even today.www.51jjcn.cn/xgn/4221.html
演变成了今天仍无法分析清楚的毒液。
315. It was not forced upon them by the survival competition;
毒液不是生存竞争强加给它们的,
316. they could have caught and lived on prey without using poison,
它们也可以不用毒液捕捉动物而生存,
317. just as the thousands of non-poisonous snakes still do.
就像今天成千上万的无毒蛇那样。
318. Poison to a snake is merely a luxury;
毒液对毒蛇来说只不过是一种舒适生存的优越手段,
319. it enables it to get its food with very little effort,
它使蛇不用费多大力气就能捕获到食物,
320. no more effort than one bite.
轻咬一口即可。
杭州新概念英语培训- 321. And why only snakes?
为什么只有蛇才有毒液呢?
322. Cats, for instance, would be greatly helped;
譬如说,如果猫有毒液,那对猫会大有帮助,
323. no running fights with large, fierce rats or tussles with grown rabbits
它就不必再和又大又凶的老鼠边跑边博斗了,也不必再和大兔子扭斗了,
324. In fact, it would be an assistance to all carnivores
因此,任何食肉动物有了毒液,都能从中获益。
325. though it would be a two-edged weapon when they fought each other.
不过,当它们相互撕打时,毒液就成了利弊参半的武器,可以杀死对方,也可以被对方的毒液杀死。
326. But, of the vertebrates, unpredictable Nature ed only snakes (and one lizard).
学校名称:杭州优朗国际英语培训学校-杭州新概念英语培训