31 Society should make efforts to save endangered species only if the potential extinction of those species is the result of human activities.

　　社会应该努力拯救濒危物种，只要这些物种的灭绝是人类活动的结果。

　　2 To understand the most important characteristics of a society, one must study its major cities.

　　要想了解一个社会最重要的特征，人们必须研究这个社会主要的城市。

　　18 The well-being of a society is enhanced when many of its people question authority.

　　当很多人都质疑权威时，社会才会繁荣昌盛。

　　26 The luxuries and conveniences of contemporary life prevent people from developing into truly strong and independent individuals.

　　现代生活的奢华和便利，让人们无法成为真正强大、独立的个体。

　　38 It is primarily through our identification with social groups that we define ourselves.

　　我们主要通过认同社会群体来定位自己。

　　53 If a goal is worthy, then any means taken to attain it are justifiable.

　　只要值得，不择手段达到目的是合理的。

　　56 Many important discoveries or creations are accidental: it is usually while seeking the answer to one question that we come across the answer to another.

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