胚胎的性别早在受精时就决定了。
她第一次接受体外受精时，那还是一个比较新的方法。
When she first underwent IVF it was still a relatively new procedure.
当卵子受精时，这些物质变得活跃起来，并可能控制与它们相互作用的基因的行为。
When the egg is fertilized, the substances become active and, presumably, govern the behavior of the genes they interact with.
在受精后大约六七个星期时，男性和女性胚胎之间没有什么差别。
For about six or seven weeks after conception, there is no differentiation between male and female.
英国人罗伯特•爱德华在周一时以“对体外受精领域的贡献”而荣获诺贝尔医学奖。
Robert Edwards of Britain won the Nobel Medicine Prize Monday for the development of in vitro fertilization.
二战时，在欧洲和非洲战场的伤病员中，士兵遭受精神创伤的比率接近每四人中就有一例病例，一人精神受创，另外三人身受重伤。
In Europe and Africa during World War II, the proportion of mental traumas among all casualties was close to one in four — one mental health case for every three blood wounds.
他们发现，当预测第二轮体外受精的成功率时，与仅根据年龄预测相比，他们（的模型）的准确率要高1000倍。
When the researchers compared the model's predictive powers with a model based on age alone, they found that it was about 1000 times more accurate in gauging success in the second round of IVF.
他用了八年时间才完成了这本小说的一部分，因为他不得不一再搁笔，去赚钱支付赛尔达住在疗养院和接受精神病医生治疗的费用。
He took eight years to finish the novel partly because he had to keep stopping to earn money to pay for sanitariums and psychiatrists treating Zelda.
当配子在融合之前从亲本体中排出到有水介质时发生体外受精，这是孢子植物的特征。
External fertilization occurs when gametes are expelled into a watery substrate from the parental bodies before fusion; it is typical of spore bearing plants.
当配子在融合之前从亲本体中排出到有水介质时发生体外受精，这是孢子植物的特征。
External fertilization occurs when gametes are expelled into a watery substrate from the parental bodies before fusion; it is typical of spore bearing plants.
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