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本课单词和词汇at large
(of a dangerous person or animal) not captured; free
Ex:Her killer is still at large.
find verb
[transitive, often passive] used to say that something exists, grows, etc. somewhere
（在某地）存在，生长
单词解析
这里的find不是“发现”的意思啊，一词多义
be found adv/prep.
1.These flowers are found only in Africa.
2.Further details can be found on our website.
spot verb
(not used in the progressive tenses)to see or notice a person or thing, especially suddenly or when it is not easy to do so 发现；注意到
A leopard can't change its spots
单词解析
spot做名词是“斑点”的意思，因此spot做动词就是某物像斑点一样，不容易被看到和发觉
spot somebody/something
1.Can you spot the difference between these two pictures?
2.I finally spotted my friend in the crowd.
accumulate verb
[transitive] accumulate something
to gradually get more and more of something over a period of time 积累；积聚
SYN amass
单词解析
这个同义词amass在59课Collecting第一行会出现,值得注意
1.I seem to have accumulated a lot of books.
2.By investing wisely she accumulated a fortune.
3.We have accumulated a great amount of evidence.
oblige verb (formal)
[transitive, usually passive]
to force somebody to do something, by law, because it is a duty, etc.（以法律、义务等）强迫，迫使
单词解析：
文中动物园的专家们感到必须去调查一下这头美洲狮，因为他们是专家，这是他们的义务，他们不去的话就没人去了。
oblige somebody to do something
1.Parents are obliged by law to send their children to school.
2.I felt obliged to ask them to dinner.
extraordinarily adverb
in a way that is more, greater or better than usual
极其（比正常水平来得更多，更大，结果更好）
单词解析：
说白了就是very,very,very，阅读写作就喜欢这种超多音节的单词（超长的单词），日常口语用very即可。
1.extraordinarily difficult
2.She did extraordinarily well.
confirm verb
to state or show that something is definitely true or correct, especially by providing evidence 证实，证明（尤指提供证据后得出的）
单词解析：
英文里意思是“证实，证明”的单词很多，这个confirm是需要提供证据才可以证实、证明的。本文中confirm这个单词出现之前，文中提到:
It immediately ran away when she saw it.
这是摘黑莓妹子的亲身经历：妹子一见到它，那美洲狮立马吓尿，甩头就撤。这个证据可信。
这是专家们可以confirm下结论的证据来源，证明美洲狮除非被逼上梁山，除此之外是没有攻击属性滴。
1.His guilty expression confirmed my suspicions.
2.Rumors of job losses were later confirmed.
observe verb [transitive] (formal)
to see or notice somebody/something 看到；观察到
单词解析：
观察也是用眼看滴，所以observe这个词可以看成see和watch的近义词。细心的小伙伴或许已经发现，第一段的spot,第二段的see和find,跟我们主角observe都是同义词。简单揪出它们各自的英英释义精准地比较一下，就可以一目了然：
spot:to see or notice a person or thing, especially suddenly or when it is not easy to do so发现;注意到
see:这个单词不需要解释
find: to discover somebody/something unexpectedly or by chance （意外或偶然地）发现
关键词discover也是用眼睛去see和watch的啊
需要注意的是：find在这里，跟本课第一句话表示“存在”的意思还是不一样。一词多义是学好英语的一大难点之一，尤其是只有一个音节的单词更常见，值得玩味。
observe：to see or notice somebody/something
问题来了，在这一篇文章，为啥L.G. Alexander（本书作者，新概念前三册的文章都是他自己写滴，不愧是英文教材的扛把子）苦心孤诣用四个不一样的单词，表达同一个意思呢？很简单，用不同的词汇表达同一个意思，显示写作者词汇量大。用词准确的话，还可以让读者觉得你的写作水平高，写作文也可以得到更高的分数。说白了：词汇量和阅读量上来了，就可以变成写作大咖啦。
observe somebody/something
1.Have you observed any changes lately?
2.I want you to observe all the details.
convince verb
to make somebody/yourself believe that something is true 使确信；使相信
单词解析：
这个单词的关键是believe，怎样才可以让专家相信，摘黑莓妹子所看到的“大型猫科动物”是美洲狮呢？要想convince专家们,还得有证据不是，那么，他们出去逛了一圈的收获是什么呢。如下：
1. 这只美洲狮早晚在不同的地方出没
2. 发现了爪印和美洲狮的毛发
3. 夜晚“猫似的鬼叫声”和商界成功人士发现的美洲狮
另外有一点值得关注——那位去钓鱼的商界成功人士直接说他看见了美洲狮，显然这句话对专家的判断是很有参考价值的。说明此人还是比较见多识广，立马断言这就是美洲狮。
而住乡下的那个摘黑莓的妹子，说看到的是“大型猫科动物”。此时专家心里肯定得犯嘀咕，大型猫科动物是什么鬼（求此刻专家心理阴影面积）。显然，这妹子是知道猫的，却对美洲狮丝毫没有概念。说明没文化还真是挺可怕的！还是要多读书多长见识呀！
convince somebody/yourself
I'd be very surprised if this argument convinces anybody.
convince somebody/yourself of something
You'll need to convince them of your enthusiasm for the job.
disturbing adjective
making you feel anxious and upset or shocked
令人不安的；引起恐慌的；寝食难安啊
a disturbing piece of news
a profoundly disturbing experience
