Turkeys are bred to be so obese that they are incapable of reproducing without artificial insemination.

人工培育的火鸡由于体型太过肥胖，已经到了离开人工授精就无法自然繁殖的地步。

The giant panda gave birth to twins after a successful artificial insemination at the DC zoo.

通过人工受精，这头大熊猫在华盛顿国家动物园成功产下双胞胎。

Today's turkeys only exist because artificial insemination has let them break through the barriers of natural selection… and gravity.

今天的火鸡之所以存在，是因为人工授精让它们突破了自然选择和重力的障碍。

Today's turkeys only exist because artificial insemination has let them break through the barriers of natural selection, and gravity.

如今的火鸡之所以存在，是因为人工授精让它们突破了自然选择和重力的障碍。

A professor became inspired by the artificial insemination process and invented it.

一名教授由人工授精得到灵感而发明了它。

One benefit of artificial insemination is that it does not require elephants to be transported from zoo to zoo, which is expensive and can be traumatic for the animals.

这项技术的一个好处是无须在动物园间将大象来回运输，这样不但费用高昂，而且动物本 身也不好受。

There is a catch, though: artificial insemination in African elephants with semen that has been frozen, as opposed to the fresh stuff, has not so far been done successfully.

到目前为止，用事先冷冻的精子（而非新鲜精子）为非洲象进 行人工授精的尝试都失败了。

Other animals, as well as humans, have been successfully bred through artificial insemination, but perfecting the process in dogs took decades because of the critical timing in fertilization of the female dog's eggs.

对于其它物种以及人类来说，人工受精已经非常成熟，但对于狗来说，由于对卵细胞的受精时间有着非常高的要求，所以对于狗的人工受精研究持续了数十年的时间。