They first injected the rats with azoxymethane, a compound known to cause colon cancer.

他们首先给老鼠注射了氮氧甲烷，一种已知会导致结肠癌的化合物。

The bacon diet reduced the number of precancerous lesions in rats injected with the azoxymethane.

在注射了氮氧甲烷的老鼠中，食用培根减少了癌前病变的数量。