1·Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。
2·One touch of a female's egg sac and they go ballistic, grappling any other male within reach.
变得争强好胜。 仅仅是对雌性卵囊接触也会使得他们反应过度，和范围内潜在的雄性扭打一团。
3·A similar sac is much bigger in other animals than it is in humans and is used to aid in digesting high cellulose diets.
在其它动物身上，类似的一个囊会更大一些，它是用来消化高纤维素食物的。
4·Worse was to come when tests also confirmed a tear in the amniotic sac, which meant the waters were leaking.
更糟糕的是，他们还检测到，羊膜囊也破裂了，羊水开始外流。
5·On average, he said, one out of every 20,000 chicken eggs contains a small amount of salmonella that is deposited into the sac by the hen.
每2万个鸡蛋中会有一个鸡蛋带有少量沙门氏菌，这是由母鸡下蛋时分泌在液囊里。