grographical variation

• 地理变异

grographical variation的用法和样例：

例句

1. Discontinuous geographic variation is often set aside as a special case.
   不连续地理变异，人们往往作为一种特殊情况把它分开。
2. Small amounts of geographic variation have been demonstrated in several other traits, such as cortical concentration of certain monoterpene.
   在其他几个性状上，亦经证明有少量地理变异，诸如皮部的某些单萜烯浓度。