n. infinitesimal ; denier
黑龙江省东北部空气中检测出极微量的放射性物质。
Extremely low levels of radioactive material have been detected from the air in the northeast of Heilongjiang Province.
只要极微量的水银散发到空气中就会产生不健康的水银蒸汽。
It takes very little mercury in air to create unhealthy levels of vapor.
结果NS组海马gdnf表达极微量，各时间点均在基线水平。
Results in group NS, GDNF immunoreactivity was very weak, and remained at the normal level at each time point.
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