like: thất thường
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
thất thường * ☊ 
erratic, irregular * ☊
[ thất ] : (1) loss; (2) seven; house, wife
[ thường ] : frequent, usual, ordinary, common, average, customary, normal; ordinarily
[ thường ] : often
[ thường ] : typically