pollution 不可数名词
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- Window or opening to admit light

作不可数名词或可数名词,後者通常作单数 - A reverse at the polls, ie a poor election result

作不可数名词或可数名词,後者通常作单数] - An uncountable noun is marked [ U ] in this dictionary.

不可数名词在本词典中以[u]标明。 - Travelbis an uncountable noun indicating the action of travelling

是指行走、行驶或旅行的不可数名词 - The word is an uncountable noun and is used in general sense , hence it takes no article.

这个词是不可数名词,又是用于一般语义,所以无须加冠词。
