Studies have shown, for example, that two drugs are about equally effective in treating macular degeneration, an eye disease.
例如，有一些研究表明，两种药物治疗黄斑变性这种眼病的效果差不多。
Macular degeneration is becoming a widespread problem.
黄斑恶化正在成为一个普遍的问题。
Age related macular degeneration is the leading cause of visual loss in older people.
老年黄斑变性是导致老年人视力衰退的主要原因。
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