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What makes some people able to face difficult circumstances with strength-and even enthusiasm-when the chances of success are slim? It's the inner will and strength to face and overcome these difficulties that makes the difference. Do you happen to know someone who has overcome difficulties on the road to success? What will you do to overcome the obstacles in your pathway? 请对以上3句话进行句子结构分析,指出句子存在的各种成分:主语,谓语,宾语等等、