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构词成分万亿分之一
anim.husb. micromicro-
万亿分之一10⁻¹²，指德、英
ecol. parts per billion ppb
万亿分之一
tech. part per trillion
美，法万亿分之一
earth.sc. parts per trillion
万亿分之一10⁻¹²，指美
ecol. parts per trillion ppt
英、德万亿分之一
oil parts per billion
万亿 分 之一: 3 phrases in 2 subjects
General1
Technology2

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