The evaluation is that the eye is clean, there is no trace of impurities .
的评价是，眼睛里是干净的，没有一丝杂质。
It contained high levels of impurities and unsafe levels of trace elements.
它含有高浓度的杂质和不安全的各级微量元素。
NF3 is a colorless gas. Trace quantities of impurities can impart a musty or pungent odor to the gas.
NF 3是无色气体。痕量的杂质会使气体带有一种霉味或刺激性气味。
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