concentration

• 指溶液中溶质的含量，即一定量溶液或溶剂中所含物质的量；也指注意力高度集中于某一事物或任务的状态。

A noun referring to the amount of a substance present in a given volume or mass of a mixture or solution, or the ability to focus one's attention on a particular task or subject.

1. Mental focusB1formal

   The ability to give all your attention to something without being distracted.

   专注力

   • The task requires a lot of concentration.
   • She lost her concentration when the phone rang.
   • Meditation can improve your concentration.

   同义词absorptionapplicationattentionattentivenessengrossmentfocussingle-mindednessthought

   反义词absentmindednessdistractioninattention

2. Amount of substanceB2formalscientific

   The amount of a substance present in a mixture or solution.

   浓度

   • The concentration of salt in the water is too high.
   • Scientists measured the concentration of carbon dioxide in the air.
   • High concentrations of the chemical can be dangerous.

   同义词contentpotencystrengthtiter

3. Gathering or clusteringB2formal

   A large number of people or things gathered together in one area.

   聚集

   • There is a high concentration of tech companies in the city.
   • The concentration of troops near the border caused concern.
   • The map shows the concentration of population in urban areas.

   同义词aggregationassemblybunchclusterclusteringcollectioncongregationcrowdgatheringmass

   反义词dispersaldispersionscatterscattering