1.Sometime after 4 million years ago, ancient equid species began trotting across the Bering land bridge.

在 400 万年前的某个时候，古老的马科种开白令陆桥。

2.Various ideas have been tossed around in the last 150 years about the African equids' stripes.

在过去的150年里，关于非洲马科身上的条纹有各种各样的观点。

3.Equines are the subfamily of equids that includes modern horses.

马科是包现代马在内的马科亚科。机翻

4.And one of the most important likely descendants of Miohippus was an equid that was even better adapted to life on the plains: Parahippus.

Miohippus 最重要的可能后代之一是一种更适应平原生活的马科：Parahippus。机翻

5.Bovids, equids and, in particular, canids, were put to work by H.sapiens; felids always took a slightly different view of the matter, but were indulged for their rodent-catching talents.

牛科、马科，其是犬科，都是由智人分工的；猫科略有不同，但受宠的原因主要是捕捉啮齿类生的天性。

6.The study is in the journal Proceedings of the Royal Society B. Various ideas have been tossed around in the last 150 years about the African equids' stripes.

这项研究发表在皇家学会学报 B 期刊上。在过去的 150 年里，人们对非洲马的条纹提出了各种不同的看法。机翻

7.For instance, the eight species of wild equids (horses and their relatives) vary greatly in disposition, even though all eight are genetically so close to each other that they will interbreed and produce healthy (though usually sterile) offspring.

例如，八种野生马科（马及其近亲）的性情差异很大，尽管所有八种野生马科在基因上非常接近，以至于它们会杂交并产生健康（尽管通常不育）的后代。机翻