双胚的移植妊娠率高于单胚，但差异不显著（P＞0.05）；
The pregnancy rate of double embryo transferred was higher(P>0.05)than that of single one.
非常有趣的是，发育中的哺乳动物晶胚的心脏在分化为四腔室前，与斑马鱼的双腔心脏非常相似。
Intriguingly, before the heart of a developing mammalian embryo separates into four Chambers, it looks similar to the two-chambered zebrafish heart.
方法采用常规的鸡胚双腔法来分离病毒。
Methods Virus isolation was performed in embryonated hen's eggs with routine method.
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