集中 + 在 + Location/Focus
集中 (jízhōng) means 'to concentrate' or 'to centralize.' It describes the act of gathering or focusing attention, resources, or objects into one point or area. It is commonly used with 在 to indicate what something is concentrated on or where it is centralized.
你上课的时候要集中注意力,不要看手机。
nǐ shàngkè de shíhou yào jízhōng zhùyìlì, bú yào kàn shǒujī.
You need to concentrate in class and not look at your phone.
我们需要把资源集中在最重要的项目上。
wǒmen xūyào bǎ zīyuán jízhōng zài zuì zhòngyào de xiàngmù shàng.
We need to concentrate our resources on the most important projects.
她把所有精力都集中在准备考试上了。
tā bǎ suǒyǒu jīnglì dōu jízhōng zài zhǔnbèi kǎoshì shàng le.
She focused all her energy on preparing for the exam.