英文: I would caution against undue optimism.
中文: 我奉劝不要过於乐观.英文: He showed undue concern over her.
中文: 他对她表现出过份的关心。英文: He did his work with undue haste.
中文: 他过度匆忙地做他的工作。英文: Forbid it with companion's undue joking while swimming.
中文: 游泳时禁止与同伴过份的开玩笑。英文: One of these is undue absorption in the past.
中文: 这些中之一过去是过分沉浸在过去。