这种双侧不对称开始出现在青少年发育的第六阶段。
This bilateral asymmetry begins to appear in the juvenile sixth stage of development.
在这种条件下，龙虾发育出了不对称的爪子，左右一半各是破碎的爪子。
Under these conditions, the lobsters developed asymmetric claws, half with crusher claws on the left, and half with crusher claws on the right.
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。
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.
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