| 1. | He unhesitatingly ranks them as varieties .
他毫不犹豫地把它们列为变种。 |
| 2. | Antibiotics favor the growth of resistant mutants .
抗菌素促成耐药变种的生长。 |
| 3. | They may endure as varieties for very long periods .
在极长时期内停留在变种阶段。 |
| 4. | There are intermediate varieties known as cannel coal .
有一些中间性的变种，叫做烛煤。 |
| 5. | Domestic races often have a somewhat monstrous character .
家养变种常具有畸形性的特征。 |
| 6. | 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。 |
| 7. | Plants which have very wide ranges generally present varieties .
分布很广的植物通常都具有变种。 |
| 8. | 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。 |
| 9. | 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。 |
| 10. | 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。 |
