obscuration
US /ˌɑːb.skjʊˈreɪ.ʃən/
UK /ˌɑːb.skjʊˈreɪ.ʃən/
1.
sự che khuất
the act of preventing something from being seen or heard, or something that prevents something else from being seen or heard:
:
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Obscuration can be obtained by the use of blackout curtains.