小镯，从你给出的例句来看，这里的number和numbers并不是单复数的区别了，而是根本不同的作用和解释。前者:the number of是一个固定词组表示数量的，后者:the numbers of the machine parts这里的numbers是号码，而且这里的the numbers of xxx，并不构成固定词组。
请再斟酌。
tulip, 关于the number of/a number of是固定词组，区别也知道，但是the numbers of xxx这个词组我没有看到过，查不到这个常用法，是不是某个句子中截下来的，还要看前后句才能判断。感觉the numbers of并不是个固定词组。
补充一下：the numbers of -----中的numbers就是一个普通的复数名词，后面谓语动词用复数。不能把the numbers of---最为和the number of同等的固定用法来看待。比如，我也可以说: those numbers of 和these numbers of。放入上下文看后，发现，numbers解释为“某个东西，事物，或者甚至是人的数字，数量，号码”等具体的名词意思。
In Scotland, the number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting, by pollution, and by various other threats to the fish’s habitat.
A. number of wild salmon have been reduced because of uncontrolled deep-sea and coastal netting,
B. number of wild salmon is reduced because deep-sea and coastal netting is not controlled,
C. numbers of wild salmon has been reduced because of uncontrolled deep-sea and coastal netting,
D. wild salmon’s numbers are reduced by deep-sea and coastal netting that is not controlled,
E. wild salmon’s numbers have been reduced by uncontrolled deep-sea and coastal netting,
The gyrfalcon，an Arctic bird of prey, has survived a close brush with extinction；its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970's.
我只知道numbers是表示总量概念，但是具体是怎么用的也不是很清楚..
贴上LDOCE里面的解释，绿底字部分：
【AMOUNT】 [U and C] an amount of something that can be counted = quantity the number of sth The number of cars on our roads rose dramatically last year. a number of sth We have been friends for a number of years. a large/small/significant/growing etc number of sth Doctors believe only a tiny number of people are at risk. The lake produces a good number of (=a lot of) salmon each season. There was an unusually high number of entries in the competition. They were printed in limited numbers . Young people have been leaving the countryside in large numbers for urban areas. Today's case brings the number of successful prosecutions in the region to (=makes the number rise to) thirty-four. There could be any number of (=many) reasons why she's late. The condors have dwindled to an estimated sixty in number . numbers [plural]
how many people there are, especially people attending an event or doing an activity together Can you give me some idea of numbers? student/client etc numbers Visitor numbers increase in the summer. The sheer weight of numbers (=large number of people) on stage made the performance more impressive.
the numbers a) information about something that is shown using numbers Chris, have you got the numbers yet? b) an illegal game in the US in which people risk money on the appearance of a combination of numbers in a newspaper playing the numbers
by numbers if you do something by numbers, you do it in a basic way by following a set of simple instructions - used to show disapproval The last thing we want is teaching by numbers.
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发表于 2004-10-20 09:41:00
发表于 2009-9-28 14:03:00
【AMOUNT】 [U and C]
The number of cars on our roads rose dramatically last year.
