I know 一场大雪is is a quantifier.like the a of the sentence " a heavy snow"but..
why we use 场?whaat is your reason?plz

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场 here is a quantifier and it's used to describe what has happened...
like 一场雪，一场雨，一场车祸，一场梦...

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Maybe becoz ancient Chinese think the snow weather is grand or magnificent .We chinese usuallu use the quantifier“场” to describe something grand~

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What's your guess if you're not told to use 场？