样本中的污染物浓度极微，远低于安全阈值。
The concentration of the contaminant in the sample was infinitesimal, well below the safety threshold.
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解释
infinitesimal在此表示化学物质的痕量级别，小到不构成实际影响的程度。
The concentration of the contaminant in the sample was infinitesimal, well below the safety threshold.
infinitesimal在此表示化学物质的痕量级别，小到不构成实际影响的程度。