Bùkěshǔ míngcí qiánmiàn tōngcháng bù jiā guàncí "a".
Uncountable nouns usually don't take the article 'a'.
Tips
grammar
Standard term in English-grammar instruction. Note that the count/uncount distinction is largely a feature of European languages — Chinese nouns aren't really categorized this way and instead use measure words for everything.
