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to remain; to abide; to stay (in the one place)
to be limited to; to be confined to; to only account for
「駐まる」 has another reading with different meanings.
記憶に駐まる映画だ。
It's a movie that stays in your memory.
被害は少ない数に駐まっている。
The damage remains at a low number.
影響は一部の地域に駐まるだろうと言われている。
It's said the impact will remain limited to some areas.