one of the local，local要加s吗 ...(It's) the study of one loc...

\u7528local\u9020\u53e5

He works at the local post office. \u4ed6\u5728\u672c\u5730\u7684\u90ae\u5c40\u5de5\u4f5c\u3002

\u5e0c\u671b\u5e2e\u52a9\u5230\u4f60\uff0c\u82e5\u6709\u7591\u95ee\uff0c\u53ef\u4ee5\u8ffd\u95ee~~~
\u795d\u4f60\u5b66\u4e60\u8fdb\u6b65\uff0c\u66f4\u4e0a\u4e00\u5c42\u697c\uff01(*^__^*)

\u4f60\u4e4b\u524d\u7684\u7406\u89e3\u662f\u5bf9\u7684\uff0c \u540e\u6765\u8ffd\u95ee\u7684\u7406\u89e3\u53cd\u800c\u662f\u9519\u7684\u3002
that of Western civilization = the study of Western civilization

\u539f\u53e5\u662f\uff1aIt's only in the study of man himself that the major social sciences have substituted the study of one local variation, that of Western civilization.

the study of one local variation\u662fsubstitute\u7684\u5bbe\u8bed\uff0c\u6240\u4ee5[that of...]\u540c\u4f4d\u7684\u662f\u5b8c\u6574\u7684\u5bbe\u8bed\uff0c
\u4e5f\u5c31\u662f the major social sciences have substituted the study of Western civilization.
that of = the study of
\u5982\u679c\u6ca1\u6709that of\uff0c \u90a3Western civilization\u5c31\u662f\u540c\u4f4d one local variation\u4e86.
...have substituted the study of one local variation--Western civilization.

\u8fd9\u53e5\u7684\u53e5\u610f\u5176\u5b9e\u5f88\u6709\u8da3\uff0c\u4f60\u80fd\u660e\u767d\u5b83\u7684\u610f\u601d\u5417\uff0c \u4f60\u4f1a\u600e\u4e48\u7ffb\u8bd1\uff1f

因为前面是one of 表示....中的一个。local在这里是名词，当地人的意思。所以要加复数。
locals
英 ['ləʊklz] 美 ['loʊklz]
n.
以复数形式泛指“当地人”;当地人( local的名词复数 );（沿线每站都停的）公共汽车;住处附近的当地酒店;地方分会
Some locals offered food and clothing to the refugees
一些当地人为难民们提供食品和衣服。
The locals are hospitable and welcoming
当地人热情好客。

要的
one of the locals （其中一个居民）

要

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