VOA慢速英语:Making Order From Life's Building Blocks

2.mutation n.（形式或结构的）转变, 改变 变化;（生物物种的）突变, 变异, 变种; 突变体

例句：The result of these experiments will be a nightmarish world filled with two-headed monsters and other mutants.
       这些试验的结果将造成一个可怕的世界,充满了双头怪和其他怪物。

3.surround vt.包围

例句：A crowd surrounded him.
      一群人围着他。

      The firemen surrounded the burning building.
       消防队员包围了熊熊燃烧的建筑物。

4.heredity n.遗传

例句：Radiation has a strong effect on the heredity of fruit flies.
      射线对于果蝇的遗传产生强烈的作用。

      Diet and exercise can influence a person’s weight,but heredity is also a factor.
      节食和运动能影响人的体重,而遗传也是一个因素。

5.unique adj.独一无二的, 仅有的, 惟一的

例句：I am in a rather unique position, as my job is different from anyone else's.
      我的情况很特殊, 因为我的工作与众不同。