expounder
n. 解释者
例句与用法：
Our teacher expounded his views on education to me at great length.
我们的老师向我详细讲述了他的教育观点。
He expounded the reasons why he did it.
他阐述了他做这件事的理由。
词形变化：
名词: expounder | 动词过去式: expounded | 动词过去分词: expounded | 动词现在分词: expounding | 动词第三人称单数: expounds |