But in people with conditions like polycythemia, the blood can get too thick, increasing the risk of blood clots, heart attack, and stroke.

但在患有红细胞增多症等疾病的人中， 血液会变得太稠，从而增加血栓、心脏病发作和中风的风险。

Likewise, a mutation in bone-marrow cells can cause the overproduction of red blood cells, like in the case of a different kind of blood cancer, called polycythemia vera.

同样，骨髓细胞的突变会导致红细胞过度生成， 就像另一种称为真性红细胞增多症的血癌一样。