他的乐观态度与她的悲观性格形成了鲜明对比。

His optimistic attitude is the ___antithesis of her pessimistic nature.

演讲中的‘要爱你的敌人，但更要恨罪恶’这句话巧妙地运用了对偶修辞。

The speech's line 'Love your enemies, but hate evil' employs ___antithesis skillfully.