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新概念英语第四册课文原文：蛇毒

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 selected only snakes (and one lizard).

然而，在脊椎动物中，大自然神秘模测地只选择了蛇(还有一种蜥蜴)，

327. One wonders saliva into why Nature, with respect from that of others, as other on the blood.

人们弄不清楚大自然为什么在某些蛇的身上调制出如此高效的毒液来。

328. In the conversion of saliva into poison, one might suppose that a fixed process took place.

人们可能认为，唾液转变成毒液，其中有固定的程序。

329. It did not;

其实没有。

330. some snakes manufacture a poison different in every respect from that of others,

有些蛇产生的毒液也在各方面与另外一些毒蛇产生的毒液不同，