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　　阅读段落

　　Thus ageing and death should not be seen as inevitable, particularly as the organism possesses many mechanisms for repair. It is not, in principle, necessary for a biological system to age and die. Nevertheless, a restricted life span ageing, and then death are basic characteristics of life. The reason for this is easy to recognise: in nature, the existent organisms either adapt or are regularly replaced by new types. Because of changes in the genetic material (mutations) these have new characteristics and in the course of their individual lives they are tested for optimal or better adaptation to the environmental conditions. Immortality would disturb this system—it needs room for new and better life. This is the basic problem of evolution.

　　段落大意

　　本段主要分析了生物体寿命的有限性，以及生物体存在衰老死亡的原因。

　　阅读笔记

　　Organism possesses mechanisms for repair → ageing and death not inevitable,

　　NEVERTHELESS

　　Basic characteristic of life：restricted life span is

　　Basic problem of evolution：Immortality disturb system—it needs room for new and better life

　　逻辑关系

　　1. 因果(逻辑连接词: BECAUSE OF)

　　Because of changes in the genetic material (mutations)

　　These have new characteristics and in the course of their individual lives they are tested for optimal or better adaptation to the environmental conditions.