https://headsalon.org/archives/387.html A Salon for Heads, No Sofa for Ass Fri, 23 Jan 2026 05:27:46 +0000 hourly 1 https://wordpress.org/?v=4.2.38 https://headsalon.org/archives/387.html#comment-6583 Mon, 16 Jul 2012 15:49:24 +0000 http://headsalon.org/archives/387.html#comment-6583 哇，绝妙的想法。两个时点的双胞胎人口比例，岂不是可以反推这一时段的生育意愿与生存压力的瓶颈程度？给它起个名叫人口压力指数怎么样？

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