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Parents are responsible for making sure their children behave well.
父母都有责任保证他们的孩子行为端正。
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The key is making sure that all Americans contribute their share.
关键是保证所有美国人分享自己的基因。
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The key is making sure that all Americans contribute their share.
关键是保证所有美国人分享自己的基因。
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