The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所观察到的晚熟球果的频率梯度变
述如下：向四周相当有规
地渐次减少。
The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所观察到的晚熟球果的频率梯度变述如下：向四周相当有规地渐次减少。
声明：以上例
、词
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