为什么at school 不用加the 而其他词要例如：at the dentist's at the dentist's

\u8bf7\u95eethe dentist's \u548c dentist's\u7684\u533a\u522b\uff0c\u5373\u4e00\u4e2a\u6ca1\u52a0the

THE \u4e00\u822c\u662f\u6709\u7279\u6307\u7684\u610f\u601d \u5373\u4e0a\u9762\u5df2\u7ecf\u63d0\u5230\u8fc7\u7684\u4e1c\u897f\u8fdb\u884c\u7279\u6307 \u6bd4\u5982The Sound of Music sound\u662fmusic\u7684sound \u7279\u6307 \u52a0the \u800cmusic\u662f\u6cdb\u6307 \u4e0d\u9700\u8981\u52a0the
\u4e00\u822c\u56fd\u5916\u7259\u533b\u7279\u6307\u81ea\u5df1\u7684\u79c1\u4eba\u7259\u533b
\u52a0the\u51a0\u8bcd
at the dentist's \u5728\u7259\u533b\u90a3\u91cc

at the dentist's
\u7f51\u7edc \u5728\u7259\u533b\u7684\u8bca\u6240;
[\u4f8b\u53e5]I had to have two fillings at the dentist's today.
\u6211\u4eca\u5929\u4e0d\u5f97\u4e0d\u5728\u7259\u79d1\u8bca\u6240\u8865\u4e86\u4e24\u9897\u7259\u3002

因为 at school 表示上学

at the school 表示在学校这个建筑物内,不一定是上学,例如你的父母去学校接你,就要用 at the school.

at the dentist's
在牙医的办公室内. 加定冠词the表示指定的那个牙医.

固定搭配,意为在学校。比如其他的如，at work指在上班，at table指在吃饭，in bed指在睡觉，in hospital指在住院

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