preoccupation

US /priːˌɑː.kjəˈpeɪ.ʃən/
UK /priːˌɑː.kjəˈpeɪ.ʃən/
1.

mối bận tâm

an idea or subject that someone thinks about most of the time:

:
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My main preoccupation now is trying to keep life normal for the sake of my two boys.