tumor promotor

例句：

1. 1. The tumor promoter gene is responsible for the development of cancer cells.
   肿瘤促进因子基因负责癌细胞的发展。
2. 2. Tumor promoters are chemicals that can stimulate the growth of tumors.
   肿瘤促进剂是能刺激肿瘤生长的化学物质。
3. 3. Researchers have identified several tumor promoters that can increase the risk of cancer.
   研究人员已经识别出几种肿瘤促进剂，它们会增加患癌症的风险。