在北美，南美以及其他一些地方生产的精子和克隆动物胚胎，其在国际范围内的交易已经无法加以有效监管。
The international trade in semen and embryos from cloned animals created in north and south America and beyond was effectively impossible to police.
对于那些不熟悉可爱的草原田鼠的人来说，这是一种在北美中部草原上发现的小型啮齿动物。
For those unfamiliar with the delightful prairie vole, it is a small rodent found in the grasslands of central North America.
在缅因州，公路交通事故中最常杀死的动物种类是北美箭猪。
In Maine, the most commonly counted roadkill species is the North American porcupine.
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