n.纯度标记；标志；特征
vt.标纯度
One hallmark of a good politician is his ability to influence people. 衡量一个优秀政治家的标志之一就是他影响大众的能力。
Clear expression is the hallmark of a good speaker. (喻)清晰的表达能力是一位出色的演说家的特征。
The research, carried out on mice, suggested caffeine hampered the production of the protein plaques which are the hallmark of the disease. 研究人员用老鼠做实验，发现咖啡因可以阻止蛋白斑块积聚，而这种蛋白是早老年性痴呆发病的典型特征。
用作及物动词 (vt.)Given the prevalence of synthetic Alexandrite, they are also a fascinating hallmark of authenticity that helps us distinguish real gems from artificial impostors. 在人工合成亚力山大石流行的今天，内含物是鉴别宝石天然纯度的一个重要标志，有助于我们将天然宝石与人工合成赝品区别开来。
