中英释义：
双语例句
他退休后觉得自己年老无用了。
When he retired he felt that he had outlived his usefulness.
他退休时方觉得自己年老无用了.
When he retired he felt that he had outlived his usefulness , ie was no longer useful.
重点词汇
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年老
old; aged; elderly; senior; advanced; age; old age; long in the tooth
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无用
useless; futile; unhelpful; worthless; ineffective; unproductive; inoperative