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以下引用的是gemj gg10月8号的帖子
首先pollutants是可数名词复数，见LONGMAN2003解释和例句：
pollutant noun [countable]
a substance that makes air, water, soil etc dangerously dirty, and is caused by cars, factories etc
air/environmental/water etc pollutants
- New regulations will reduce hazardous air pollutants.
- a dumping ground for toxic pollutants
chemical/industrial etc pollutants
- industrial pollutants in the lake
其次，LESS一般修饰（指代）不可数名词，但也可以指代可数名词，请见该词典的解释：
less 2 determiner, pronoun
a)
less of
The map covered less of the area than I'd thought.
Flying is less of a risk than driving.
less 2
b) used to mean 'fewer' or 'not as many', although many people think this use is incorrect ￚopposite more
- There were less people there than we expected.
我想A）与B）结合起来便有了less of certain pollutants的说法。
除了这个帖子，我又查了韦氏，补充一下韦氏上面的关于fewer，less的用法：
The traditional view is that less applies to matters of degree, value, or amount and
modifies collective nouns, mass nouns, or nouns denoting an abstract whole while
fewer applies to matters of number and modifies plural nouns. Less
has been used to modify plural nouns since the days of King Alfred and the usage,
though roundly decried, appears to be increasing.
Less is more likely than fewer to modify plural nouns when distances, sums of
money, and a few fixed phrases are involved
例：less than 100 miles
an investment of less than $2000
in 25 words or less
同时在修饰periods of time时，less 和 fewer 可以替换
例：in less (or fewer) than four hours
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发表于 2003-12-9 15:53:00
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