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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度变异描述如周相当有规律地渐次减少。

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TED-Ed(视频版)

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.

存在年度, 它们会自发释种子,还有一种称为休眠类型,它们需要环境触发才能释种子。

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3G, 401(K), a,
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