以下为句子列表：
英文: Because both unexplained infertility and immunologic infertility are treated with intrauterine inseminations, the usefulness of sperm antibody testing is limited.
中文: 因为不论是原因不明的不孕或免疫抗体造成不孕,解决的方法都是做人工授精.
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英文: A team at the Chemnitz University of Technology in Germany, led by Matthias Rosenberger, has transformed the usefulness of the test by feeding its results into high-capacity computers.
中文: 在德国开姆尼斯技术大学，由马地亚斯·卢森博格领导的研究团队把测试的结果输入高能的计算机以改变测试的有效性。
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英文: After donating several dogs to policemen, their usefulness as Police Dogs was demonstrated.
中文: 在上校向警方捐赠了几只德牧；警方试用后，德牧作为警犬的能力得到证实。
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英文: But whatever its short-term usefulness for clamping down on inflation, monetarism proved an unreliable lodestar for steering the economy.
中文: 但无论货币主义对降低通货膨胀在短期内是多么有效，它并不是掌控经济的可靠原则。
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英文: Consider the postage stamp: its usefulness consist in the ability to stick to one thing till it get there.
中文: 想想那邮票吧：其用处在于它能粘住一样东西直至达到目的为止。
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