每个孩子，都是妈妈的一颗行走在身体外面的心！
这多么奇怪，相对于我们身体外面的对称性，我们内部却是那么不对称。
It is strange how, given the symmetry of our external bodies, we are so asymmetrical on the inside.
然而，昆虫其实有六条腿，身体分为三部分，还有外骨骼，即长在身体外面的骨骼。
But an insect actually has six legs, a three-part body, and an exoskeleton, which is a skeleton on the outside of its body.
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