他像堂吉诃德一样，总是追逐那些不可能实现的梦想。

Like a ___Quixote, he always chases after impossible dreams.

他总是梦想着拯救世界，真是个不切实际的堂吉诃德式人物。

He's always dreaming of saving the world - such a ___quixote, completely impractical.