As civilization has advanced, our living environment and sources of food have become more sanitary.
因为文明的进步,我们的生活环境以及食物来源已经变得比较卫生。
And as civilization has advanced, our living environment and sources of food have become more sanitary.
又因为文明的进步,我们的生活环境以及食物来源已经变得比较卫生。
And as civilization has advanced, our living environment and sources of food have become more sanitary.
又因为文明的进步,我们的生活环境以及食物来源已经变得比较卫生。
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