The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所观察到晚熟球果梯度变异描述如下：相当有规律地渐次减少。
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Serotinous cones are produced in thousands, and are like waterproofed time capsules sealed with resinous pitch.
成千上万的晚熟松果，犹如密封的防水囊。
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.
一种松果每自然释放种子，而另一种则为晚熟松果，它们需要一个环境来触发释放他们的种子。
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划词翻译
详细解释
晚熟球果
梯度变异
描述如下：
相当有规律地渐次减少。
频版） 
密封的防水
自然释放种子，而另一种则为晚熟松果，它们需要一个环境来触发释放他们的种子。
