关于英语方面的问题。

\u82f1\u8bed\u65b9\u9762\u7684\u95ee\u9898

\u7ffb\u8bd1\u6ca1\u9519\uff0c\u4f46\u53e5\u5b50\u9519\u4e86\uff0cdifficulty\u662f\u526f\u8bcd\uff0c\u8fd9\u91cc\u9700\u8981\u5f62\u5bb9\u8bcd\uff0c\u5e94\u6539\u4e3adifficult

never \u4e00\u822c\u5c31\u662f\u53e3\u5934\u7701\u7565\u7528\u6cd5\uff0c\u610f\u601d\u662fhe has never been to China.\u5c31\u662f\u4e00\u6b21\u4e5f\u6ca1\u6709\u7684\u610f\u601d\u3002none \u662f\u9488\u5bf9\u201c\u4eba\u201d\u800c\u8a00\uff0c\u6bd4\u5982\u95ee\u6709\u591a\u5c11\u4eba\u65f6\uff0c\u6ca1\u6709\u4eba\u7684\u56de\u7b54\u5c31\u7528none.\u5173\u4e8enone\u7684\u7528\u6cd5\uff0c\u8be6\u7ec6\u53ef\u4ee5\u770b\u770b\u5b57\u5178\uff0c\u4f1a\u6709\u6536\u83b7\u7684\u3002

一般情况下,表示一类人或者事物,有两种表达,a +n 单数 或者n复数形式
例如这里A doctor is a person who saves people‘s life。
或者Doctors are persons who save people‘s life。

一般是这两种表达形式来表示一类

而the doctor有定冠词the,一般是用于特指,经常是前面出现了某事物,后面要特指这个事物时,用the, 例如前面介绍了某医生,后面说这医生怎样怎样,就用the doctor

定冠词The有特指的意思,而不定冠词A,An没有特指的意思,
A/The doctor is a person who saves people‘s life.
在这个句子中,应该用The,因为这个句子中的医生是特指那个救人生命的人,
如果用A,就不知道到底是哪个医生救人的生命(也就是没有特指),所以不能用A,而应该用The.

定冠词后接确定的人或物,指某个或某些。不定冠词后接不确定的人或物,指某类。

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