n. the strength of a solution; number of molecules of a substance in a given volume
n. the spatial property of being crowded together
n. strengthening the concentration (as of a solute in a mixture) by removing diluting material
n. increase in density
n. 集中, 专心
[化] 浓度; 浓缩
1. I need to improve my concentration to study effectively.
我需要提高我的注意力，以便有效学习。
2. The loud music made it hard for me to maintain my concentration.
吵闹的音乐让我很难保持注意力。
3. Meditation can help increase your concentration and focus.
冥想可以帮助提高你的注意力和专注力。