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下：向四周相当有规律地渐次减少。
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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.
存在常规的年度球果， 它们释种，有一种称为休眠球果的类型，它们需要环境触才能释种。
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划词翻译
详细解释
下：向四周相当有规律地渐次减少。
释
种
，
有
