One reason weight control is especially important is that children who are overweight will often have a problem with weight all their lives.麻煩幫助我理一下句子結構,謝謝!

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One reason (that) …… is that ……weight control is especially important做One reason的定語children who are overweight will often have a problem with weight all their lives是that的內容。One reason后面省略了that，引導了第一個定語從句，children前的that引導了賓語從句，who引導了定語從句。

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先找到句子主干 one reason is that children will often have a problem with weight all their lives. 那么weight control is especially important 整個是one reason的定語成分,可以先這樣看 [一個原因]什么樣的原因呢?[控制體重尤為重要的(原因)] 因此,第二個is 以前是句子的主語,其后that引導的是表語從句,顯而易見,who are overweight 是children的限制性定語從句.整個翻譯一下就是"(控制體重尤為重要的)一個原因是(超重的)孩子們將在他們的一生中為體重煩惱." 其中all one's life是"某人一生"的意思

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減肥尤其重要的一個原因是超重兒童一生中常常遭遇體重方面的麻煩。主語是One reason ，而weight control is especially important 是One reason 的定語從句(省略了that)；第二個is引出表語從句，其中主結構為：children will often have a problem with weight，而who are overweight是children的定語從句，all their lives是狀語

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one reason 是主語，weight control is especially important 是同位語，is是謂語，that是形式賓語，children who are overweight will often have a problem with weight all their lives.是真實的賓語，就是that指代的內容，who are overweight 是定語