microgram

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In the UK drinking water can contain no more than 100 micrograms of THM per litre. A microgram is one millionth of a gram.
在英国每升饮用水中三卤甲烷（THM）不允许超过 100 微克（一微克是一克的一百万之一）。
Levels of free testosterone found in the 300-microgram-dose group were close to those usually seen in women ages 18 to 24 years.
研究发现，在300微克小组，其组员身体内游离睾酮含量水平与18-24岁女性通常含量非常接近。
Whether this has a potential for carry over into food at low concentrations (usually in the range of microgram per kilogram) and could further impact human health may need further evaluation.
关于这种情况能否导致少量成分（通常在微克/公斤范围内）进入食物，继而对人类健康产生影响可能还需要进一步的评估。

微克
Experiment results also showed that papaverine has been absorbed and distributed by 30～60 mg after intramuscular injection or intravenous injection,the concentration of drug acted on the remote end was very tiny, by calculating only several microgram could reach fingers.
而且有研究表明罂粟碱30～60 mg肌注或静脉注射后经过吸收和分布,作用于远端的药物浓度甚微,经计算到达手指仅有几微克。
教育学
微克