Arsenic is an element poisonous to every other living creature in the planet except for a few specialized microscopic creatures.
砷是一种对地球上所有其他生物有毒的元素，除了对少数特别的极小的生物。
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Strange bacteria living deep in a California lake can survive on arsenic and can even grow by incorporating the element into its DNA and cell membranes.
As lead and arsenic pollution element are skew distribution, statistics of a natural background value and a content of lead and arsenic are worked out using median method of skew distribution.