1.Pumas are large，cat-like animals which are found in America.
美洲狮是一种体形似猫的大形动物，产自美洲。
知识点1 which定语从句修饰animals。
知识点2 cat-like是“n.+adj.”结构的复合形容词，作定语，此类还有：lady-like女性化的，man-like男人般的，crystal-like水晶般的，baby-like婴儿般的，dog-like像狗一样的，steel-like钢铁般的，home-like像家一样的，angel-like天使般的，dream-like梦境般的。
知识点3 large和cat-like都是描述型定语从句，修饰animals。选择合适的词翻译“大的”或“胖的”。修饰动物：fat,huge；修饰男人：strong，heavy；修饰女人：large，plump；修饰小孩：robust，chubby。
知识点4 在写作中模仿使用本句结构。
例：1.Koalas are small，bear-like animals which live in Australia.
2.When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London，they were not taken seriously.
当伦敦动物园接到报告说，在伦敦以南45英里处发现一只美洲狮时，这些报告并没有受到重视。
知识点1 本句是一个由when引导的时间状语从句加that引导的分隔式同位语从句构成的复合句。
知识点2 had been spotted（过去被发现）中spot用词独具匠心，强调在荒野“发现”美洲狮不容易。例句：I finally spottedjust the book I wantedin the bookstore.
知识点3 写作短语模板：take sh. seriously认真对待某事，take sth. easy轻松地做某事，take sb./sth.lightly小看某人/某事，be unsympathetic to sth.对某事很冷漠，show low regard to/for sth.对某事不在意，be indifferent to sth.对某事不感兴趣，be not interested in doing sth.对做某事不感兴趣，take one's time about doing sth.认真做某事。
知识点4 写作模板：例：When news came into the departments concerned that bird flu had been spotted 30km east to the city,it was taken seriously.
3.However，as the evidence began to accumulate，experts from the Zoo felt obliged to investigate，for the descriptions given by people who claimed to have seen the puma were extraordinarily similar.
可是，随着证据越来越多，动物园的专家们感到有必要进行一番调查，因为凡是声称见到过美洲狮的人们所描述的情况竟是出奇地相似。
知识点1 本句包含了as引导的时间状语从句，以及for引导的原因状语从句。最后是who引导的定语从句，修饰people。
知识点2 写作短语模板：feel obliged to do sth.感到有必要做某事，it is necessary for sb to do sth.某人有必要做某事，be forced to do sth.被迫做某事，feel/be impelled to do sth.感到有必要做某事（内因），be compelled to do sth.被迫做某事（外因）。
知识点3 写作模板：As the proof began to gather,the police felt obliged to interrogate this suspect further,for the descriptions given by people who claimed to have seen the suspect were remarkably similar.
知识点4 claim to have seen，声称看到过，to have seen是动词不定式的现在完成时结构，做claim的宾语。
