Than 后面省略了those problems that;斜体部分为定 语从句，修饰省略的problems。
迈耶博士的老鼠遇到的难题比其在自然条件下遇到 的问题难得多。
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But human breakdowns are ordinarily caused by problems that human beings themselves have created : problems of religious and ethical* belief; problems of money and credit and mortgages* and trust funds and stock market fluctuations; problems of man-made custom and etiquette* and social organization and law.
The fingers were gnarled, lumpy, with long, curving nails suggestive of animal claws. 那些手 指粗糙、不平，有着又长又弯的使人想起动物爪 子的指甲。
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II. Sentence
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[ 9 ] There is, however, an important difference between the insolubility of the rat's problems and the insolubility of human problems..Dr. Maier's rats were driven to their nervous breakdowns by problems more complicated than would naturally occur in a rat's environment.
Eg:
They had to mortgage their home to pay the bills. 他们不得不抵押他们的房子来还账。
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3. etiquette n. rules for formal relations or polite social behaviour among people, or in a class of society or a profession 礼节，礼仪
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研究生英语精读教程 (第三版·上)
Unit Three part 9、10
第八组
I. New wadj. 道德的 a). of or relating to the philosophical study of
ethics :ethical codes; ethical theories b). conforming to accepted standards of social
social etiquette 社交礼仪；社交礼节；社交规矩 greeting etiquette 问候礼仪；问候的礼仪 dressing etiquette 着装礼仪
This was such a great breach of etiquette, he hardly knew what to do. 这是一起规矩的严重违 反，他几乎不知所措了。
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2. mortgage n.抵押 vt.抵押
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n. a conditional conveyance of property as
security for the repayment of a loan
v. put up as security or collateral
junior mortgage 次级按揭；非优先抵押；次级抵押 mortgage lender 抵押放贷者；典质放贷者；款公司 mortgage lending 抵押贷款；抵押存款；典质贷款； legal mortgage 法定式按揭；法定按揭；法定抵押
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[ 10 ] Rats can hardly be blamed for not being able to solve problems set for them by Dr. Maier; there are limits to a rat's powers of abstraction. But there are no known limits to the human capacity to abstract and organize and make use of abstractions. Hence, if human beings find problems insoluble because of fixated reactions if they are frustrated because they can respond in only one way, regardless of context or circumstances, to certain symbolically defined situations - they are functioning at less than full human capacity.
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4. suggestive adj. tending to suggest or imply artifacts suggestive of an ancient暗示的；提示的； 影射的
Suggestive marks 暗示性商标；暗示性标章；暗 示性的商标 Suggestive teaching 暗示教学 Suggestive contours 轮廓线
or professional behavior: an ethical lawyer; Ethical medical practice an ethical problem had no ethical objection to drinking ; Ours is a world of nuclear giants and ethical infants . c). adhering to ethical and moral principles: It seems ethical and right .