Meanwhile, the article studies objects of beauty and its four evolving stages, thus clarifying the fact that the essence of beauty is continuously evolving.

同时考察了美的对象及美的四个演变阶段，从而阐明了美的本质也在不断演变这一事实。

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This paper studied the essence of P. E. from logical viewpoint, and on the base of clarifying the difference between essence and essential attributes, pointed out that the essence of P.

本文从逻辑学的视角探讨体育的本质，并在明确本质与本质属性区别的基础上，指出体育的本质是“教育”；

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