like: hồi âm
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
hồi âm * ☊ 
(1) to reply, answer (a letter); (2) to echo * ☊
[ hồi ] : Islam, Islamic
[ hồi ] : time (when something happened), when
[ âm ] : (1) sound; (2) lunar; (3) Yin, female, negative, minus; (4) reading (of a Chinese character)