VOA慢速英语:Improve Your Pronunciation by Humming

pitch – n. the highness or lowness of a sound

hum – v. to sing the notes of a song while keeping your lips closed

mirror – v. to be very similar to (something)

syllable – n. to place emphasis on (something)

emphasize – v. to place emphasis on (something)

attainable – adj. ability to succeed in getting or doing (something)