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少子化
一个社会中随着人口总和生育率下降,少年儿童(0-14岁)占总人口比重降低的现象。一般将一个国家的总和生育率长时间低于维持人口长期稳定发展的更替水平(2.1),界定为少子化。
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Birch and Swinnerton-Dyer
Birch conjecture
Birch equation
birch family
Birch-Murnaghan equation of state
Birch reduction
bird and mammal damage to forest
bird banding
bird cage
bird cherry-oat aphid
bird communication
bird feeder jar
birdie
bird impact test
bird-in-hand theory
Bird Island
Bird Lady: Painted Terracotta Figurine of a Woman
Bird Men
bird migration
bird-nest fern
bird reproduction
bird rhythm
bird ringing
Birds and Flowers by Qian Xuan
birds and rats share a cave
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