Only about 10 to 15 per cent of affected people suffer this more dangerous form.
只有约10 ％至15 ％的受影响的人民受苦，这更危险的形式。
It's estimated that about 400,000 Americans suffer some form of the disease.
据估计，在美国大概有400,000人患有视网膜炎色斑。
It's estimated that about 400,000 Americans suffer some form of the disease.
据估计，在美国大概有400,000人患有视网膜炎色斑。
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