The length of telomeres gradually decreases with increasing age and cell division number, which can lead to chromosome instability, so the changes in telomere length are closely linked to cell aging.
端粒的长度随着年龄和细胞分裂次数的增加而逐渐变短，因而导致染色体不稳定，因此端粒长度的变化与细胞衰老密切相关。
Cells have two copies of nearly every chromosome (one each from the mother and father) and they must duplicate these during cell division so that the subsequent cells will also have two each.
每条染色体细胞都含有两个拷贝(一个来自母方，一个来自父方)，当细胞分裂时，这些染色体就要复制，因此子代细胞仍有两个拷贝。
Cells have two copies of nearly every chromosome (one each from the mother and father) and they must duplicate these during cell division so that the subsequent cells will also have two each.
每条染色体细胞都含有两个拷贝(一个来自母方，一个来自父方)，当细胞分裂时，这些染色体就要复制，因此子代细胞仍有两个拷贝。
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