... perceived usefulness 认知有用性 ; 感知有用性 ; 知觉有用性 ; 有用性认知 lost usefulness 效用消失 And Usefulness 和有用性 ...
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Chess programming, however, has not lost its usefulness.
然而，国际象棋程序并没有就此止步。
The challenge for companies is to figure out how to manage consumer technologies in a way that doesn\'t limit their usefulness but doesn\'t result in lost time and money.
面对消费用技术，公司面临的挑战是如何管理这些技术既保证其功效，又不会损失工作时间或金钱。
The present should never be chained to customs which have lost their usefulness.
绝不可用那些已经无用的习俗来束缚现在的手脚。
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