like: mấu chốt
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Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
mấu chốt * ☊ 
key, clue * ☊
[ mấu ] : notch, tooth
[ chốt ] : axle, bolt, pin, key, latch, wedge, dowel
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