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异描: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.
成千上万的晚,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.
一每年定期自然子,而另一则为晚,它们需要一个环境来触发他们的子。
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