[問題] 關於writing的句法(part 1)

[mybuddha (假以時日)]

  今天讀到眾文高分寫作
  有一句，不得其解，請各位幫幫忙

  An approximate 215,000 of these procedures were conducted on women.

  在這裡的 An 作何解？
  後面的Be 動詞是were....


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推 brooklu:An (number =  approximate 215,000) of ?
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