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parts per billion (ppb)
parts per billion (ppb)
英
[parts per billion (ppb)]
美
[parts per billion (ppb)]
中文释义
十亿分之几, 十亿分率
单词分析
单词结构:
parts per billion (ppb)
字母数:23
记忆提示
🎯 重点记忆:
单词拼写:parts per billion (ppb)
核心含义:十亿分之几, 十亿分率
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更新时间:2026-04-11 12:06:13