... Contour, 界线线 Contribution rate, 孝敬率 Control, 比较 ...
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孝敬率
Filial piety rate
以上为机器翻译结果，长、整句建议使用 人工翻译 。
生育率越来越低的原因很复杂，但是其中一个原因肯定是因为子女对父母孝敬不够。
The reasons that people are having fewer children are complex, but one of them must certainly be that children don't give much back.
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