B1 [ I or T ] to direct your attention or your efforts towards a particular activity, subject, or problem专注,专心;全神贯注;集中(注意力)
More examples
I couldn't concentrate on my work - my mind was on other things.
She was concentrating on her book and his voice startled her.
Just try to concentrate on hitting the ball.
I can't concentrate because of all the noise the builders are making.
It's a good film, but the plot is very complicated and you really have to concentrate.
C1 [ T usually passive or I, usually + adv/prep ] to bring or come together in a large number or amount in one particular area集中;聚集;会集;集结
[ T ] to make a liquid or substance stronger and reduce its size by removing water from it使浓缩
a liquid from which some of the water has been removed浓缩物;浓缩液
specialized geology an ore from which rock has been removed精矿
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