... trace program 跟踪程序; 追踪程序; 示踪程序 trace quantity 示踪量; 痕量 trace range 跟踪范围 ...
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痕量元素 [地化] trace element ; micro element ; [地化] accessory element ; minor elements
痕量物质 Trace materials
痕量化学 [分化] trace chemistry
痕量气体 trace gas
痕量杂质 trace impurity ; trace of impurity ; trace impurities
超痕量杂质 ultratrace impurity
痕量成分 [分化] trace constituent ; trace component
痕量浓度 trace concentration
大气痕量气体 [气象] atmospheric trace gas ; ambient trace-gas
它们在天然煤(或称“全”煤)中仅以痕量存在，并不构成问题。
They occur in such trace amounts in natural, or "whole," coal that they aren't a problem.
正如违禁药品的情况一样，痕量的合法药物也通过了污水处理设备的过滤。
Much like illegal drugs, traces of pharmaceuticals often filter through traditional sewage-treatment processes.
总结了一些微量元素和痕量元素对形变铝合金组织、性能的影响。
The effects of some trace elements on structures and properties of wrought aluminium alloys are summarized.
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