885 sec 11-16

以下是引用gemj在2003-10-8 1:46:00的发言：
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。