台湾籍旅美老师今天交给我们的句子是：

As they divide, these cells may accumulate additional mutations. These mutations may cause the cell to become less specialized and stop performing its original function in the tissue. If this occurs, then there's a greater chance they'll develop into cancer cells.
这些细胞在分裂时，有可能会累积生成额外的突变。而这些突变可能破坏细胞的功能性，使其无法发挥原先在组织中应有的功能。这种情况如果发生，这些细胞便极有可能演变成癌细胞。

学习重点：

1.divide 划分
divide (v.) 划分
division (n.) 分开、部门

2.accumulate 累积
accumulate (n.) 累积

3.mutate 变化
mutate (v.) 变化
mutation (n.) 变化

4.specialized 专门的
specialized (adj.) 专门的
speciality (n.) 专长

5.occur 发生
occur (v.) 发生
occurrence (n.) 出现
recurrence (n.) 再现