a tense used to express action that is on-going at the time of utterance
同义词：present progressive tense
The Progressives and their present-day descendants have largely succeeded at eroding freedom.
FORBES: The "On Your Own" Economy
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。