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sensor
mastery UK /ˈsɛn.sə/ US /ˈsɛn.sɚ/noun
card 1 of 10 · fill in the blank
The motion sensor _____ the wall detected movement in the dark hallway last night.
card 1 of 10 · fill in the blank
The motion sensor _____ the wall detected movement in the dark hallway last night.