他的心脏已经分成了四个腔室，瓣膜也开始形成了。
His heart has divided into four Chambers and its valves are beginning to form.
心脏也有四个腔室，也是红的。
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.
应用推荐