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   English
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parts per quadrillion
el. 千万亿分率; 千万亿分之…美、法计数制
parts per quadrillion
earth.sc. 千万亿分之
 English thesaurus
parts per quadrillion 10-15
abbr. ppq (MichaelBurov)
Parts Per Quadrillion
abbr. ppq (Ilves)