单词	microgram
释义	microgram /ˈmʌɪkrə(ʊ)ɡram / noun One millionth of a gram. (Symbol: μg) The concentrations of manganese in two samples of surface soil taken from area A were 748 and 629 micrograms per gram, dry weight.... The trouble was that a mere microgram (millionth of a gram) can kill, if lodged in the lungs. The rats received either 60 or 300 micrograms per kilogram of body weight.
随便看	power-suited power supply power surge power system power take-off power tie power tool power-to-weight ratio power tower power train power transformer power transistor power trio power trip power-tripping power tube power unit power-up power user power valve power-walk power-walker power walking power wash power washer

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