legitimate birth rate
... legitimacy 正统性 legitimate birth rate 合法出生率 legitimate claim 合法要求 ...
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1947年(当时人工流产已经合法化)到1957年间,因为流产手术,出生率减半。
Between 1947 (when abortion was legalised) and 1957, the birth rate was cut in half due to abortions.
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之后,堕胎合法化及节育措施开始影响日本的人口出生率。
Then, legalized abortion and birth control began to reduce the birth rate.
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