影响衰老的主要因素有：遗传基因，胚胎发育，教育，阶级属性，事业，生活方式，身份地位，物理和精神状况，社会活动等。
Our genetic inheritance, our quality of life in utero, education, class, career, lifestyle, status, levels of physical, mental and social activity are just some of the main influences.
一个社会的中产阶级也许是整个社会状况的晴雨表，但一个社会如何对待它的底层民众才是衡量制度好坏的一个更好的指标。
A society's middle class may be the ultimate barometer for health, but how a society treats its lower class is a better indicator of overall virtue.
然而，这种社会状况并不妨碍商人阶级的出现。
This state of society, however, is not destitute of a mercantile class;
文艺工作者要学习社会，这就是说，要研究社会上的各个阶级，研究它们的相互关系和各自状况，研究它们的面貌和它们的心理。
Writers and artists should study society, that is to say, should study the various classes in society, their mutual relations and respective conditions, their physiognomy and their psychology.
文艺工作者要学习社会，这就是说，要研究社会上的各个阶级，研究它们的相互关系和各自状况，研究它们的面貌和它们的心理。
Writers and artists should study society, that is to say, should study the various classes in society, their mutual relations and respective conditions, their physiognomy and their psychology.
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