单词vocative
n.: 呼格；呼格词；呼语
adj.: 【语】呼格的；呼唤的
网络: 称呼成分；呼唤功能；呼唤鼓动类
呼格；呼格词；呼语:
the form of a noun, a pronoun or an adjective used when talking to a person or thing
呼唤语;呼格
【语法】呼格的;呼唤的
呼唤;称呼
复数：vocatives
Thus different national people may have their own vocative expressions.
不同的民族有其不同的称呼系统。
It is quite free for the second person subject in vocative imperative sentences to appear or hide, but there still are some rules in it.
呼语祈使句第二人称主语的隐现比较自由，但“是隐是现”还是呈现出一定的倾向性。
Cross-cultural Comparison of Vocative in Chinese and English Criticism Speech Act
中英批评言语行为中称呼语的跨文化对比研究
Correction and Translation of Informative and Vocative SL
信息类与感染类源语的改进与英译
Comparative Study of the Fuzzy Words in English and Chinese Vocative System
英汉称谓语系统中的模糊语使用比较