You have to be prepared for a long wait, maybe after two years.

你必须做好长期等待的准备，也许要等到两年之后。

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But so far, improvement in vision has persisted as long as two years after a single treatment without evidence of significant adverse side effects.

但到目前为止，在经过一次性治疗后，病人视觉的改善最长已经维持了两年时间，没有证据显示出现了明显的不良副作用。

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Two years after macabre new relics are discovered at the site of the ancient seaside town, National Geographic provides haunting photos and new details on the long-dead victims of Vesuvius.

自古老的海滨小镇发现罹难者遗骸两年后，国家地理发布了一系列触目惊心的照片和新细节。

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Mr Fowler retired from the Canadian foreign service two years after a long career that included postings as ambassador to Italy and the United Nations.

BBC: Tuareg rebels deny UN kidnapping

MediaGate is finally launching its heralded media serving products here in the US of A, after spending two painstakingly long years parading around and thrilling folks in Japan.

ENGADGET: MediaGate finally launches MG-350HD, MG-35, and MG-25P in the US

Two years after the ouster of long-serving strongman Hosni Mubarak, Egypt is in the throes of a full-blown economic crisis.

FORBES: The Brotherhood's Agenda, Cairo's Catastrophe