虽然毫无疑问，持续的压力是有害的。但有几项研究表明，在具有挑战性的情况下，如果你能够迎难而上，可能对你有好处。

While there's no question that continuous stress is harmful, several studies suggest that challenging situations in which you're able to rise to the occasion can be good for you.

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虽然疼痛可能既让人畏惧而又无法避免，有可以毫无疑问的就是：人类已经可以处理一些较小的慢性疼痛病例。

Although pain may be a horrible necessity, there is no doubt that humanity could cope with far less of the chronic sort.

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较贵的药物--雷珠单抗注射液（Lucentis）--每注射一次2000美元（约13600元），病患可能每4-6周就需要注射一次。 毫无疑问它的药效良好；实际上，这是第一种针对AMD可以扭转视力下降的有证药物。

The expensive version - Lucentis - is about $2000 per injection, and patients may need a shot every 4 to 6 weeks.

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