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315 Activities V
exact: like: kiên cố
VNEN 
kiên cố * ☊ 
strong, solid * ☊
[ cố ] : (1) to make an effort, try (very hard); (2) great grandfather; (3) to pawn; (4) reason; (5) old, former, late (deceased); (6) intentional, premeditated; (7) firm, strong; (8) innate, original; (9) to look after, care for, turn one’s head