小范围内的高度土壤变异是很常见的，特别是在森林里。
A high degree of soil variability in a small area is common, particularly within forests.
有些拷贝数变异是很常见的，但还有一些则在人类中极少发生或是发生的频率较低。
Some CNVs are common, but others are rare or occur with low frequency among humans.
这些基因变异体有多么常见呢？
这也能说明为何此基因尽管在老年有毁灭性影响但却是一常见的变异体。
It also suggests why the variant is common despite its debilitatingeffects in old age.
这也能说明为何此基因尽管在老年有毁灭性影响但却是一常见的变异体。
It also suggests why the variant is common despite its debilitatingeffects in old age.
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