其生存价值是什么？
However, goods can be desirable for a reason other than survival value.
但是，货物不单具备生存价值，还有其它取悦人心的原因。
If intelligence has high survival value, why are so few creatures intelligent?
如果说智能有很强的生存值，那么为什么智能生物会如此之少？
If intelligence has high survival value, why are so few creatures intelligent?
如果说智能有很强的生存值，那么为什么智能生物会如此之少？
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