Heart tube formation is one of the most important events in the early heart development.
心管的发生是心脏发育早期最重要的事件之一。
Humans are asymmetric animals. Early in our embryonic development, the heart turns to the left. The liver develops on the right. The left and right lungs have distinct structure.
人类是不对称的动物，在我们胚胎发育的早期，心脏就转向了左边，肺则往右长，而且左、右肺具有完全不同的结构。
The heart appears as a simple tube early in development;
在发育早期心脏以一个单一的管道出现；
The heart appears as a simple tube early in development;
在发育早期心脏以一个单一的管道出现；
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