Ken was in the act of paying his bill when Neil arrived.尼尔到时, 肯正在付账。
He saw Jones in the act of snatching a gun.他看见琼斯一把抓起枪。
英汉双解词典包含368430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。