集中

We must narrow the focus to the most pressing issues.

Power should not be concentrated/centralized in the hands of a few.

keep one's concentration

pool energy and resources to accomplish the project

concentrate/focus (exclusively) on the modernization drive

combat crimes on a large scale

concentrate/focus one's attention (on)

gather/collect one's thoughts

pool the wisdom of the masses

concentrate one's energy (on); centre one's efforts (on)

concentrate fire (on a target)

sum up ideas from all quarters

gather together troops; muster forces/troops