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十亿分之一
agric.	part per billion (ppb)
ecol.	parts per billion (ppb, 10⁻⁹，指美、法)
tech.	billionth (10⁻⁹); part per billion (10 ~9)
telecom.	billi-
water.res., ecol.	parts per billion
十亿分之一10⁻⁹
auto.	nano-
十亿分之一10-9
chem.	parts per billion
"十亿分之一"
nautic., tech.	parts of billion (ppb)
十亿分之一的
gen.	billionth
十亿分之一〔的〕
earth.sc.	billionth
十亿分之一［10一9］
el.	parts per billion

十亿 分 之一 : 4 phrases in 4 subjects

Air defense	1
Architecture	1
Business	1
General	1