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简易的说 a后面加了名词 只是泛泛的说
the后面加了名词 就是有特指了 就好像你说着带the的 脑子里就有这个东西的摸样和位置了
比如: i would like to buy A football.
i would like to buy THE football in his hand.
tha's A cat.
that's THE cat that scratched me.