fidelity [fɪˈdeləti]

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n.忠诚，忠实；精确

honest or lasting support , or loyalty , especially to a sexual partner

There is nothing like a dog's fidelity. 没有什么能比得上狗的忠诚。
His fidelity and industry brought him speedy promotion. 他的尽职及勤奋使他很快地得到晋升。