The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .
所的晚熟球果的频率梯度变异描述如下:向四周相当有规律减少。
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Serotinous cones are produced in thousands, and are like waterproofed time capsules sealed with resinous pitch.
万的晚熟松果,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.
松果每年定期自然释放子,而另为晚熟松果,它们需要个环境来触发释放他们的子。
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