electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds

同义词：telephone??/??telephone set

(phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language

同义词：speech sound??/??sound

electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear

同义词：earphone??/??earpiece??/??headphone

get or try to get into communication (with someone) by telephone

同义词：call??/??telephone??/??call up??/??ring