concentration

concentration
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。
    ■(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。
    ■[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。
    ■[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
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