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hearing dog

noun
🔊/ˈhɪərɪŋ dɒɡ/
🔊/ˈhɪrɪŋ dɔːɡ/
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  1. a dog trained to make a deaf person (= a person who cannot hear well) aware of sounds such as the ringing of a phone or a doorbell导聋犬（经训练用来提醒耳聋者如电话铃、门铃等声响）Topics Animalsb2