它也许能查出为非洲斑马变种进行分类这样晦涩难懂的课本文字，却找不出任何有关一般动物的合乎情理的描述。
It may be able to retrieve obscure texts on, say, the classification procedures for African zebra variants, but be incapable of producing anything sensible about animals in general.
有许多奇异的事实，可举出说明牛羊及其它动物的新品种，以及花草的变种是怎样迅速地代替了那些较老而低劣的种类。
Many curious instances could be given showing how quickly new breeds of cattle, sheep, and other animals, and varieties of flowers, take the place of older and inferior kinds.
但是，流感病毒通常是针对不同种类的动物滋生出不同的变种病毒，跨物种传染的情况很少。
However, the "flu" virus usually develops different variants that are specialized for each species of animal that they infect. Cross species infections are rare.
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