one-trillionth英'wʌntr'ɪliənθ美'wʌntr'ɪliənθCOCA²³⁶⁹³⁷ 基本英英近义反义例句 n.一万亿分之一¹⁰⁰ Noun: one part in a trillion equal parts近义词trillionth一万亿分之一… Drug amounts registered between29 and850 picograms— a picogram is one-trillionth of a gram — per cubic meter of air. 其每立方米空气毒品含量为29到850皮克之间—1皮克等于1万亿分之一克。 yeeyan