Many carcinogens come into contact with a wide area within the oral cavity and oropharynx, so the idea is that they cause field cancerization.

许多致癌物可以广泛接触到口腔和口咽内，故有一个猜这些物质引发区域癌化。

This treatment lowered the number of senescent and cancerous cells, suggesting the microbes were indeed to blame for promoting cancer.

此时，他们的怀疑得到了证实。这方法减少了老化和癌化细胞的数量，表明微生物确实诱发癌症的因素。

These are immune-system cells whose job is to kill other body cells that have been infected with viruses, or which have turned cancerous.

这些免疫系统细胞能吞噬被细菌感染的细胞或癌化细胞。