变种

• He unhesitatingly ranks them as varieties .
  他毫不犹豫地把它们列为变种。
• Antibiotics favor the growth of resistant mutants .
  抗菌素促成耐药变种的生长。
• They may endure as varieties for very long periods .
  在极长时期内停留在变种阶段。
• There are intermediate varieties known as cannel coal .
  有一些中间性的变种，叫做烛煤。
• Domestic races often have a somewhat monstrous character .
  家养变种常具有畸形性的特征。
• This is a variation of the methods shown in fig. 2. 20 .
  这是图220所示的方法的一个变种。
• Plants which have very wide ranges generally present varieties .
  分布很广的植物通常都具有变种。
• The two varieties intergrade over a narrow transition zone .
  这两个变种在较窄的过渡地带有中间类型。
• Many varieties existed which differed from one another in clear-cut ways .
  存在许多可以截然区分的变种。
• The man can neither originate varieties, nor prevent their occurrence .
  人类既不能创造变种，亦不能阻止变种发生。