If you find problems early and get treatment, you can delay or prevent the loss of vision.

若你及早地发现了问题并接受治疗，那么就能延迟或预防失明的发生。

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"This suggests the possibility that a treatment like this could be tested to see if it could delay the onset of Alzheimer's disease," said Prof Holtzman.

“这意味着存在这样的可能性：可以对这种治疗方式进行测试，看看它是否能推迟老年痴呆症的发作，”霍茨曼教授说。

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Do not delay treatment if ophthalmic anesthetic solution is not readily available.

如果眼部麻醉剂溶液不容易得到，不要延误治疗。

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Extensions would only be granted if a visitor could show an unexpected or compelling reason, such as the need for medical treatment or a delay in completing a business matter, one official said.

BBC: The Grand Canyon