concentration
/ˌkɒnsənˈtreɪʃən/noun
1
- mass noun the action or power of focusing one's attention or mental effort专心, 专注; 注意力：
frowning in concentration
蹙额深思
the worker needs total concentration.
这个工人需要全神贯注。
1.1
concentration on/upon
dealing with one particular thing above all others（仅）处理; （仅）注重：concentration on the needs of the young can mean that the elderly are forgotten.
对年轻人需求的注重可能意味着对老年人的忽视。
2
- a close gathering of people or things聚集者; 集中物; 集结物：
the island has the greatest concentration of seabirds in the north-west.
此岛集中了西北部最多的海鸟。
2.1
- mass noun the action of gathering together closely集中; 集结：
the concentration of power in the hands of nobles.
贵族手里集中的权力。
3
- the relative amount of a particular substance contained within a solution or mixture or in a particular volume of space; the amount of solute per unit volume of solution浓度; 含量：
the gas can collect in dangerous concentrations.
此种气体能聚积到引起危险的浓度。
3.1
- mass noun the action of strengthening a solution by the removal of water or other diluting agent or by the selective accumulation of atoms or molecules浓缩。