求翻译：4．In addition to skewing the country’s age distribution, the one-child policy has probably exacerbated its dire gender imbalance. Many more baby boys are born in China than baby girls. China is not unique in this; other countries, notably India, have encountered similar problems without coercive population controls. But Chinese officials do not dispute that the one-child policy has played a role. China’s strong cultural imperative for male offspring has led many families to do whatever they must to ensure that their one permissible child is a son. In the earliest days of the one-child policy, this sometimes meant female infanticide. As ultrasound technology spread, sex-selective abortions became widespread.是什么意思？

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