一个主要催化剂老化是过分的应力。

One main catalyst of aging is excessive stress.

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在老化期间有三个主要类型的细胞过分积累于身体中：脂肪细胞、老细胞和某些类型的免疫细胞。

There are three main classes of cells that accumulate in the body during aging to a supernumerary degree: fat cells, senescent cells and certain types of immune cells.

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通过分析目前湖南省大中型水轮泵站现存的主要问题，文章提出了泵站的老化评估方法及其数学模型。

By means of analyzing the key problems in water-turbine pump stations of Hunan province, the aging assessment of pump stations and its mathematics model are put forward.

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