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radar
mastery UK /ˈɹeɪdɑː/ US /ˈɹeɪˌdɑɹ/nounverb
card 1 of 10 · preposition
The control tower spotted an unidentified aircraft _____ radar during the storm.
card 1 of 10 · preposition
The control tower spotted an unidentified aircraft _____ radar during the storm.