有些动物在笼子里不产崽。
有些动物在笼子里不产崽。
牛牛在里面产崽，为了保护它的幼崽，它一边产崽一边被人观察着。
Niuniu had given birth inside and was now being observed ashe lay, protecting her cub.
大熊猫的妊娠时间能持续11周到11个月不等，甚至到产崽时也不容易被发现。
Panda pregnancies can last anything from 11 weeks to 11 months and can remain undetected until shortly before birth.
通过采用增多排卵、人工授精和胚胎移植技术，农民可以使每母牛产崽数增加两倍多。
By employing the techniques of super-ovulation, artificial insemination, and embryo transfer, farmers can more than triple the number of offspring produced by a single cow per year.
格陵兰海豹主要生活在冰上，并且在冰上产崽。这么做，部分原因是出于躲避陆地上的掠食者。
Harp seals make ice their main habitat, and they give birth on ice, partly as protection from predators on land.
冬末时，成百上千只走投无路的海豹来到纽芬兰PortauChoix港及其他沿海湾地区，就在靠海岸线的零零碎碎的冰块上产崽了。
In Port au Choix, Newfoundland, and other communities around the gulf, hundreds of desperate harp seals arrived in late winter to give birth on fragments of ice clinging to the shoreline.
另一个原因是熊妈妈可能不够胖，无法为它们的幼崽产奶，所以一些熊可能会停止生育。
The other reason is that mother bears may not be fat enough to produce milk for their babies, so some bears could stop having babies.
动物会产奶是为了满足各种物种的幼崽的需要，奶牛幼崽和人类婴儿的成长需要肯定是大相庭径的。
Animals are designed to give milk that meets the needs of the infants of their species. Baby cows have completely different growth needs than baby humans.
一般说来，狼一胎能产下四到六只幼崽。
刚巧在收割完牧草之后，杰西和布鲁·贝尔产下九条小狗崽。
It happened that Jessie and Bluebell had both whelped soon after the hay harvest, giving birth between them to nine sturdy puppies.
雌象每产下一只幼崽的时间是2至4年，幼象诞生时重约200磅(91公斤)，高约3英尺(1米)。
Cows usually give birth to one calf every two to four years. At birth, elephants already weigh some 200 pounds (91 kilograms) and stand about 3 feet (1 meter) tall.
这两只熊猫是从中国运到苏格兰的，人们希望它们能产下幼崽。
The bears were brought to Scotland from China in the hope that they will produce cubes.
日前，比利时动物园的一只大熊猫产下了幼崽。由于大熊猫产仔的几率非常低，于是这件事被称为“真正的奇迹”。
A giant panda cub has been born at a zoo in Belgium, an event so rare it is being described a "true miracle".
相比之下，鱼龙和其他现代胎生的物种产下多个幼崽。
Ichthyosaurs and other contemporary viviparous species, by contrast, gave birth to multiple offspring.
明年，长胡子哒熊将在后方产一头可恶得小崽。
Next year the bearded bear will bear a dear baby in the rear.
这两只熊猫是从中国运到苏格兰的，人们希望它们能产下幼崽。
Thee bears were brought to Scotland from China in the hope that they will produce cubes.
这两只熊猫是从中国运到苏格兰的，人们希望它们能产下幼崽。
Thee bears were brought to Scotland from China in the hope that they will produce cubes.
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