The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所观察到的晚的频率梯度变异描述如下：向四周有规律地渐次减少。
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Serotinous cones are produced in thousands, and are like waterproofed time capsules sealed with resinous pitch.
成千上万的果，犹如被树胶密封的防水胶囊。
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.
一种果每年定期自然释放种子，而另一种则为果，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
的频率梯度变异
描述如下：向四周
有规律地渐次减少。
版） 
果，犹如被树胶密封的防水胶囊。
