white 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。 - Its distinctive markings--broad, white bands of fur alternating with black, and small black circles around the eyes--have endeared the giant panda to animal lovers everywhere.
它全身黑白色相间的宽条纹以及小小的黑眼圈，是它最明显的标志，也因而受到各地动物爱好者的喜爱。
