تمرکز 用英语:

Concentration is a very simple thing.

I immediately lost my concentration.

It's the sort of work that calls for a high level of concentration.

This year's freshly inducted employees are, to a man, lacking in concentration, and their sloppy work leaves me speechless.

During the Stalinist era, prisoners at concentration camps became slaves in service of the state.

Korean mental hospitals have been compared to concentration camps. Patients are said to be treated like animals who are subjected to violence and maltreatment rather than therapy.