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如下：向四周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.
成千上万晚熟果，犹如被树胶密封胶囊。
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.
果每年定期自然释放子，而另则为晚熟果，它们需要个环境来触发释放他们子。
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划词翻译
详细解释
如下：向四周相当有规律地渐次减少。
频版） 
晚熟
果，犹如被树胶密封
胶囊。
