The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所
到的晚熟球果的频率梯度变异可描述如下：向四周相当有规律地渐次减少。
The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所到的晚熟球果的频率梯度变异可描述如下：向四周相当有规律地渐次减少。
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