这种病是一种诊断不足、威胁生命的疾病，目前在全世界影响2.1亿人。
The condition is an under-diagnosed, life-threatening disease that currently affects 210 million people worldwide.
这种病是一种诊断不足、威胁生命的疾病，目前在全世界影响6400万人。
The condition is an under-diagnosed, life-threatening disease that currently affects 64 million people worldwide.
那些可威胁生命的疾病数目，尤其对于那些微弱的免疫系统，预期会增加。
The number of illnesses, which can be life-threatening, especially to those with weakened immune systems, is expected to increase.
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