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十亿分率
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〔ppb〕
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十亿分率
，十亿分之…
美国传统
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to be sad
to be satisfactory
to be satisfied
to be saved from
to be scared
to be scattered
to be scrupulous
to be seduced
to be seen
to be seen by
to be sensible
to be sensitive
to be separated
to be set
to be set on
to be settled
to be severe
to be sharp
to be shocked
to be short
to be short of
to be sick
to be silent
to be similar
to be skilful
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更新时间：2025/2/22 16:22:53