名词
中文翻译：致癌前体物
同义词：
['pre-carcinogen', 'preneoplastic agent']
例句：
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1.Exposure to certain chemicals can increase the risk of developing cancer.
暴露于某些化学物质可能会增加患癌症的风险。
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2. The study found that exposure to tobacco smoke was a significant risk factor for lung cancer.
研究发现，暴露于烟草烟雾是肺癌的一个显著风险因素。
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3. Regular exercise has been shown to reduce the risk of several types of cancer.
研究表明，定期锻炼可以降低几种类型癌症的风险。