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.
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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