pollen size

• 花粉大小

pollen size的用法和样例：

例句

1. Except for some differences in exine ornamentation and pollen size, there is no great evolutionary divergence among genera in pollen morphology.
   总体来讲，花粉没有大的演化分异，只是表面纹饰和花粉大小有一定的差异。