18. stable=characteristic=constant=steady=fixed=unchanging adj.稳定的
19. life span=duration of life 寿命
20. biological clock=internal clock 生物钟
21. prolong=extend=drag out=spin out v.延伸,延长
22. principle=law=conscience=scruples n.原则,法则
23. optimal=better=best adj.最佳的
24. conserve=save / frugal=reserve=keep back v.节约,保存
25. immortality : the state of living for ever or being remembered for ever adj.不朽的
26. organism=living thing=life form=wildlife =an animal, plant, human, or any other living thing n.有机的
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