- sub-parts-per-billion-level
- Золотодобыча: ниже одной частицы на миллиард, уровень ниже одной частицы на миллиард
Универсальный англо-русский словарь. Академик.ру. 2011.
Универсальный англо-русский словарь. Академик.ру. 2011.
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