white marker的用法和樣例：
例句
- To ealuate nicotine exposure more precisely, they measured study participants' blood leels of cotinine -- a marker for nicotine exposure.
為了精確評估尼古丁的危害程度，研究人員檢測了自願者血液中的吡咯烷酮的含量，該物質為尼古丁體內存在含量的標誌。 - 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.
它全身黑白色相間的寬條紋以及小小的黑眼圈，是它最明顯的標誌，也因而受到各地動物愛好者的喜愛。
