因此，直到最近发现蜥脚类恐龙筑巢地的化石之前，科学家们还不能确定蜥脚类动物到底是产卵还是胎生。
Until the recent discovery of fossilized sauropod nesting grounds, scientists were thus uncertain whether sauropods laid eggs or gave birth to live young.
近一个世纪前，生物学家发现，如果他们在无脊椎动物胚胎生命的早期阶段将其分成两部分，它会存活下来并发育成两个正常的胚胎。
Nearly a century ago, biologists found that if they separated an invertebrate animal embryo into two parts at an early stage of its life, it would survive and develop as two normal embryos.
鲨鱼有三种繁殖方式，它们的繁殖方式因物种而异，分别是卵胎生、胎生和卵胎生。
Sharks display three ways to bear their young, varying by species, oviparity, viviparity and ovoviviparity.
从人胚胎生殖嵴、肠系膜中消化分离的原始生殖细胞，将其接种在人子宫内膜成纤维细胞饲养层上传代培养。
PGC from genital ridge and mesenterium of human embryo was incubated on fibroblast feeder layers for subculture.
凡禽鸟都是卵生，而它却是胎生的。
Every birds bird is oviparous, and it is viviparity however.
这些结果与大豆胚胎生长速率对高光照的反应相一致。
These results are consistent with a high irradiance response for growth of soybean embryos.
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.
目的：探讨胎盘异铁蛋白对小鼠胚胎生长发育的影响。
Objective: To assess the effect of placental isoferritin in vitro on mouse embryo development.
一项新研究发现，近半数美国人希望头一胎生的是男孩。
Almost half of Americans want their first child to be a boy, according to a new study.
淋巴细胞的干细胞，在胎生期来自肝脏，出生后则由骨髓产生。
The stem cells of lymphocytes are in the liver in fetal development and in the bone marrow in postnatal life.
红树植物具有特殊的胎生现象，胎生分为显胎生和隐胎生两种。
Mangroves possess distinctive vivipary. Vivipary is divided into two types:cryptovivipary and exposed vivipary.
上帝对夏娃说他将增加她怀胎生产的苦楚，她也要受丈夫的管辖。
God told Eve she would suffer pain as she gave birth to children, and that her husband would rule over her.
多胞胎生育的，每多哺乳一个婴儿，每次哺乳时间增加30分钟。
Much afterbirth embryo bears, every many lactation a baby, every time lactation time increases 30 minutes.
在北美市场，白炭黑消耗量基本上由欧洲轿车轮胎生产厂商所控制。
In North America, white carbon black consumption is basically a car tire manufacturer in Europe controlled.
通过直接观察和胃容物分析对胎生蜥蜴的捕食行为和食性进行了研究。
With direct observation and stomach dissection, this paper studied the predatory behavior and meal habit of Lacerta vivipara.
届时，女性首胎生育时间将平均提前5个月，绝经时间平均晚10个月。
They will have their first child 5 months earlier and go through menopause 10 months later.
一百多年的轮胎生产经验造就了倍耐力轮胎舒适，耐用，安全的优异性能。
Over one hundred years experience of tire technology has enabled Pirelli to combine in their products maximum levels of security, longevity and comfort.
含绳层的耐摸生胶，轮胎生产未经加工过的废弃品，经过硫化，并扎成整捆件。
D. This is rubber friction, which contains cords. It's the fresh rejected material during the tire production but it is Unvolcanised. And it's compressed in bales.
多胎生产被排除了，因为甚至在自然状态下，怀三胞胎也有很高的患并发症的风险。
Multiple births were excluded because even naturally conceived multiples have a high risk of complications, Romundstad says.
这家轮胎生产商去年年报公告亏损，公司表示将致力于开拓高价轮胎以及海外市场。
The tire maker, which reported a loss for the period a year earlier, said it focused on higher-priced tires and international markets.
作为全球最大的轮胎生产国，中国的国产品牌轮胎企业正面临着生产过剩的危机。
China as the world's largest tire manufacturing country, China's domestic brand of tire is facing overcapacity.
鱼龙和鲸类的另一点相似在于：不像其他目前存活的卵生爬行类，他们胎生生下后代。
Ichthyosaurs also resembled cetaceans in another way: unlike most living reptiles, which lay eggs, they gave birth to live young.
但用于汽车轮胎生产量，常加入一定量的金红石型产品，以增强抗臭氧和抗紫外线能力。
But for car tyres production, often join a certain amount of rutile type products, to enhance the ozone resistance and ultraviolet ability.
结果表明，胚胎生长所需的生长因子在低密度培养条件下被稀释并影响胚胎的正常发育。
The results show that factors necessary for normal embryo development are diluted to suboptimal levels during culture at low embryo concentration.
轮胎生产企业在制定经销商政策时常出现四大误区，在制定经销商政策时，应遵循五大原则。
When working out the policies of dealers, the tyre production enterprises, often fall into four wrong areas, should follow five principles.
但我们今天使用的合胞体蛋白基因可能实际上已取代了最初病毒传给第一个胎生哺乳动物的基因。
But the syncytin genes we use today may have actually replaced an ancestral one that a virus bequeathed to the very first placental mammals.
胎生苗在脱落与散布时表现出的特点说明：胎生苗的扩散行为是与其特殊的环境条件相适应的。
The traits showed when the viviparous plantlets abscise and disperse that the dispersing behavior for the viviparous plantlets is adaptable to the special environment.
在胎生苗叶片产生以前，它的营养全部由母体提供，属于全异养阶段，这是一种典型的觅源行为；
Before the formation of leaves, the nutrition for the development of viviparous plantlet is supplied by its parent, which is a kind of typical foraging behavior.
在胎生苗叶片产生以前，它的营养全部由母体提供，属于全异养阶段，这是一种典型的觅源行为；
Before the formation of leaves, the nutrition for the development of viviparous plantlet is supplied by its parent, which is a kind of typical foraging behavior.
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