空谷足音 kōng gǔ zú yīn

DEFINITIONS

  1. the sound of footsteps in a deserted valley (idiom)
  2. sth hard to come by
  3. sth wonderful and rare

CHARACTERS

空 kōng
HSK 3
empty, hollow, bare, deserted
谷 gǔ
HSK 6
valley, gorge, ravine
足 zú
HSK 2
foot; attain, satisfy, enough
音 yīn
HSK 3
sound, tone, pitch, pronunciation