它们还会排挤正常的骨髓细胞，导致在骨髓中新产生的正常细胞数量减少。
They also crowd out the normal cells in the marrow; in turn, this causes a decrease in the number of new normal cells made in the marrow.
有雀斑的人呢，他们的黑色素细胞数量是正常的，只是他们的黑色素细胞产生了一些黑素。
People with freckles have a normal number of melanocytes; their melanocytes just create clusters of melanin.
这些做法的目的都是要是CD4细胞的数量达到正常值，并且使HIV病毒的数量保持在不易检出的水平。
The goal is to get the CD4 count as close to normal as possible, and to suppress the HIV amount of virus in the blood to an undetectable level.
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