“I seem to remember that it was Charles Darwin who first wrote about the survival of the fittest，” Grandpa said。 “I am beginning to think that is the reason that they want me to climb this mountain to have my blood pressure （血压）checked！” This term， the survival of the fittest， refers to the idea that only the strongest and most adaptable（适应的）animals or plants are able to survive （生存）。“And the weak ones perish，”Grandpa added。

　　适者生存

　　“我记得适者生存最早好像是由达尔文提出来的。”祖父说，“我想，他们希望我爬到山上以后再检查血压恐怕就是因为这个原因。”the survival of the fittest，适者生存，的意思就是最强壮和适应能力最强的动物和植物才能够生存。祖父补充说：“那些弱者就被淘汰了。”