名词

1. 全神贯注;专心;专注
Concentration on something involves giving all your attention to it.

2. 集中;汇集
A concentration of something is a large amount of it or large numbers of it in a small area.

3. 浓度
The concentration of a substance is the proportion of essential ingredients or substances in it.

1. strengthening the concentration (as of a solute in a mixture) by removing diluting material

2. bringing together military forces

3. great and constant diligence and attention

Synonym: assiduityassiduousness

4. the strength of a solution
number of molecules of a substance in a given volume

5. the spatial property of being crowded together

Synonym: densitydensenesstightnesscompactness

6. complete attention
intense mental effort

Synonym: engrossmentabsorptionimmersion

7. increase in density