单词	nanogram
释义	nanogram /ˈnanə(ʊ)ɡram / (abbreviation ng) noun One thousand-millionth of a gram.In oral fluid, drugs of abuse can be detected for 5-48 hours at a low nanogram per milliliter level.... The North Pacific contains about 1 nanogram of PCBs per litre. He tested positive for the banned substance methamphetamine when a nanogram of the chemical was detected in his urine sample.
随便看	probability space probability theory probability wave probabilize probable probable cause probable error probableness probablise probablize probably proband probang Pro-Banthine Probanthine probasidial probasidium probate Probate Act probate bond probate court probate duty probate judge probate judgeship meta-historical

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。