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315 Activities V
exact: like: phản ứng tự nhiên
VNEN 
phản ứng tự nhiên * ☊ 
natural reaction * ☊
[ phản ] : (1) wooden bed, camp bed; (2) to turn back, oppose, be contrary; (3) to counter, betray
[ ứng ] : to respond
[ tự ] : (1) Chinese character; (2) Buddhist temple, pagoda; (3) from, since; (4) oneself, on one’s own, self-; (5) otherwise known as, alias