PSF: In Pine Effect came from material over a couple of years, right?
貌似《松树效应》的创造材料跨越了好几年，是这样么？
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It's not easy material, and deserves to be read slowly and perhaps a couple times - much like any sophisticated treatise on a difficult but powerful subject.
A person or creature will do something selfless if the act still saves enough of its own genetic material - say, the amount carried in a couple of brothers or a half-dozen Cousins.