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

多致癌物可以广泛接触到口腔和口咽内，故有一个猜想就这些物质引区域癌。

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。这种喂养方法减少了老和癌细胞的数量，表明微生物确实癌症的因素。

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细胞。