B2 [ U ] the ability to think carefully about something you are doing and nothing else专注,专心
More examples
This is a very difficult piece of music to play - it demands a lot of concentration.
Heart surgery exacts tremendous skill and concentration.
The job demands a high level of concentration.
Hyperactive children often have poor concentration and require very little sleep.
Even a low level of noise interferes with my concentration.
C2 [ C or U ] a large number or amount of something in the same place集中;聚集;汇集
[ C or U ] specialized chemistry the exact amount of one particular substance that is found in another substance浓度
noun¹
noun²
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