第一个句子是定语从句，that only取代先行词reason，在从句中作宾语(he explained the reason)；第二个句子是名词从句，2011中考时间。
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he explained the reason
他解释了原因。
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He explained the reason why he was made to catch the offenders.
他解释他被要求抓违章者的原因。
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The reason, he explained, is mistrust of the media.
他解释说，自己这样做的原因是出于对媒体的不信任。
None of us accepted the reason he explained, for which he was absent.
我们没有一个人接受他所解释的缺席的理由。
In fact, he felt so good that during the meal, shortly before they ordered dessert, he explained the reason for his trip to Paris.
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So Listiev gathered a group of his closest friends and explained the reason he might be killed.
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"The main reason is cramping and soreness in the whole body, " he explained later.
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