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1.The observed clinal variation in the frequency of serotinous cones may be described as a fairly regular decrease in all directions .

1.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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原声例句
TED-Ed（频版）

1.Serotinous cones are produced in thousands, and are like waterproofed time capsules sealed with resinous pitch.

成千上万的晚熟松，被树胶密封的防水胶囊。

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TED-Ed（频版）

2.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.

一种松每年定期放种子，而另一种则为晚熟松，它们需要一个环境来触发放他们的种子。

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