但是有些树木生长速度很快。

But some trees can grow quickly.

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在地球上，人们认为，表明太阳黑子周期最可靠的迹象之一是树木的生长速度，就像树干横截面上可见的年轮一样。

On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.

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研究发现，城市树木的碳循环速度和生长速度几乎是乡村树木的四倍。

It was discovered that rates of carbon cycling and growth rates among city trees were nearly four times faster than those in the countryside.

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