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	reshut reside residence residence city residence counsellor residence counselor residence-general residence order residence time residency resident resident adviser resident alien resident assistant resident commissioner residenter residential residential care residential home residential hotel residentially residential school residentiary residentiaryship resident magistrate

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。