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concentrations的英文翻译是什么意思，词典释义与在线翻译：
英英释义
名词 concentration:
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the strength of a solution; number of molecules of a substance in a given volume
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the spatial property of being crowded together
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strengthening the concentration (as of a solute in a mixture) by removing diluting material
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increase in density
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complete attention; intense mental effort
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bringing together military forces
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great and constant diligence and attention
