hum noun

ADJ. faint, soft | low | high-pitched | constant, continuous, steady I could hear the constant hum of distant traffic. | background

VERB + HUM hear

PREP. ~ of the background hum of the air-conditioning

hum verb

ADV. quietly, softly | happily | tunelessly | along humming along with the music

VERB + HUM begin to He began to hum, somewhat tunelessly.

PHRASES hum to yourself She was humming softly to herself.

You can also check Google Dictionary: hum (English, 中文解释 )

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