指数: (numerical, statistical) index, (math.) exponent, index, exponential (function, growth)...
缓缓: slowly, unhurriedly, little by little...
辨别: to differentiate, to distinguish, to discriminate...
前任: predecessor, ex-, former, ex (spouse etc)...
恩惠: favor, grace...
心疼: to love dearly, to feel sorry for sb, to regret, to grudge, to be distressed...
委婉: tactful, euphemistic, (of voice etc) suave, soft...
不用: need not...
毕业生: graduate...
奏效: to show results, effective...
