initiating carcinogen的用法和樣例：
例句
- The term of chronic irritation as a carcinogen is so vague that it is not easy to discuss.
慢性刺激作為致癌因子，其意義是如此含糊以致不易加以討論。 - The most promising approach is to look for biomarkers such as the carcinogen pyrene in body fluids like urine.
最有前景的進(jìn)展是在尿液等體液中尋找類(lèi)似致癌因子的生物標記物。
