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。

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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。

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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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