...a lecture which led to a half-hour of stimulating dialogue afterwards.
...给后面带来半个小时激烈讨论的一场演讲。
...the half-hour wait before he was rescued.
...他在获救之前等待的那半个小时。
英汉双解词典包含141091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。