* 分区函数：将数组按pivot分成两部分
Does new science get us closer to finding out how life on earth began?BBC Inside Science
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In the Sicilian town of Giarre overlooking Mount Etna, Andrea Passanisi, a tropical and citrus fruits producer, uses an unusual fertiliser on his 100-hectare (247-acre) stretch of land: volcano ash.
Example output from criterion.