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单词 concentration
释义

concentration

Definition
Quantity of a substance dissolved in, or mixed with, per unit quantity of another substance. Concentration is expressed usually as per unit-volume (such as milliliters per liter), per unit weight (such as milligrams per kilogram), parts per million (PPM) or parts per billion (PPB).
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更新时间:2025/3/9 23:14:13