The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所观察到球果频率梯度变异描述如下：向四周相当有地渐次减少。
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Serotinous cones are produced in thousands, and are like waterproofed time capsules sealed with resinous pitch.
成千上熟松果，犹如被树胶密封防水胶囊。
There are the regular annual cones that release seeds spontaneously, and another type called serotinous cones, which need an environmental trigger to free their seeds.
一种松果每年定期自然释放种，一种则为熟松果，它们需要一个环境来触发释放他们种。
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划词翻译
详细解释
球果
描述如下：向四周相当有
地渐次减少。
频版） 
，
一种则为
