1. 他退休后覺得自己年老無用了。
   When he retired he felt that he had outlived his usefulness.
2. 無用缺少實用性、價值或效果的；無價值
   Lack of usefulness, worth, or effect; worthlessness.
3. 這個人欺騙了你，因為這臺機器毫無用處。
   The man has imposed on you, because this machine is worthless.
4. 說即使最后一次鐘聲已經(jīng)消失，消失的再也沒有潮水沖刷的映在落日余暉里的海上最后一塊無用礁石之旁時，還會有一個聲音，人類微弱的、不斷的說話聲，這也很容易。
   That from the last ding-dong of doom and clang had faded from the last worthless rock hanging tireless in the last red and dying evening, that even then, there will be one more sound, that of his puny and inexhaustible voice still talking.
5. 這些文件毫無用處，只配扔進廢紙簍里。
   These documents are useless - they are only wastebasket fodder.

無的英語翻譯：

用的英語翻譯：