他退休后觉得自己年老无用了。 When he retired he felt that he had outlived his usefulness.
无用缺少实用性、价值或效果的；无价值 Lack of usefulness, worth, or effect; worthlessness.
这个人欺骗了你，因为这台机器毫无用处。 The man has imposed on you, because this machine is worthless.
说即使最后一次钟声已经消失，消失的再也没有潮水冲刷的映在落日余晖里的海上最后一块无用礁石之旁时，还会有一个声音，人类微弱的、不断的说话声，这也很容易。 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.
这些文件毫无用处，只配扔进废纸篓里。 These documents are useless - they are only wastebasket fodder.
