Tap water can have as much as 15 parts per billion (ppb) of lead owing to pipes, while bottled water is allowed a maximum of 5 ppb.
由于管道的原因,自来水的铅含量可能高达15 pbb(十亿分之十五),而瓶装水的铅含量最高为 5 ppb。
单词 | ppb |
例句 |
原声例句
中高级英语短文 Tap water can have as much as 15 parts per billion (ppb) of lead owing to pipes, while bottled water is allowed a maximum of 5 ppb. 由于管道的原因,自来水的铅含量可能高达15 pbb(十亿分之十五),而瓶装水的铅含量最高为 5 ppb。 |
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