急性淋巴细胞性白血病(all)是一种发生于血液和骨髓的癌症——骨髓(译者：此处指红骨髓)是指作为造血场所的骨内的海绵组织。
Acute lymphocytic leukemia (ALL) is a type of cancer of the blood and bone marrow - the spongy tissue inside bones where blood cells are made.
急性淋巴细胞白血病和急性粒细胞性白血病均由癌变的母细胞引起，如淋巴母细胞或原始粒细胞。
Acute lymphocytic leukemia and acute myelogenous leukemia are each composed of blast cells, known as lymphoblasts or myeloblasts.
相对于急性白血病，慢性淋巴细胞白血病和慢性粒细胞性白血病通常进展缓慢。
Chronic lymphocytic leukemia and chronic myelogenous leukemia usually progress slowly compared to acute leukemias.
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