Until becoming acquainted with these facts, I was unwilling to believe in the frequent early death of hybrid embryos; for hybrids, when once born, are generally healthy and long-lived, as we see in the case of the common mule.

在了解这些事实之前， 我不愿意相信杂交胚胎经常早死；因为杂交种一旦出生， 一般都健康长寿， 就像我们在普通骡子身上看到的那样。