单词：reflective marker
reflective marker的用法和样例：
例句
- To ealuate nicotine exposure more precisely, they measured study participants' blood leels of cotinine -- a marker for nicotine exposure.为了精确评估尼古丁的危害程度，研究人员检测了自愿者血液中的吡咯烷酮的含量，该物质为尼古丁体内存在含量的标志。
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