At first, the heart is a simple tube that soon begins to beat regularly. Then it grows it grows so fast that there is no room for it to become longer inside the embryo.
起初，心脏只是一个简单而可以规律的搏动的管子，由于它长的实在太快以至于在胚胎里没有它变长的空间。
At first, the heart is a simple tube that soon begins to beat regularly. Then it grows it grows so fast that there is no room for it to become longer inside the embryo.
起初，心脏只是一个简单而可以规律的搏动的管子，由于它长的实在太快以至于在胚胎里没有它变长的空间。
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