Finally, they say the British must prove they can actually detect XMRV in one of the American samples, something that they would have been delighted to provide had they been asked.

最后，他们说英国科学家必须证明他们确实能够在一个美国样品中检测出XMRV，如果需要，他们很愿意提供样品。

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However, there are three things that U.S. officials say must be addressed in this agreement when it is finally hammered out.

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