This is the 13751st most frequent Korean word.
마스크에서
"From the mask" or "at the mask" (depending on context).
In this sentence, '마스크에서' (from the mask) refers to the source location of the smell.
마스크에서 이상한 냄새가 나요.
The mask has a strange smell.
Here, '마스크에서' (in the mask or because of the mask) describes the action of the mask covering the face.
그는 마스크에서 얼굴을 가린 채로 나타났어요.
He appeared with his face hidden by the mask.
In this sentence, '마스크에서' (within the mask) indicates the function related to the mask's ability to filter materials.