expatiated

The professor expatiated on the importance of sleep for nearly an hour.

教授花了将近一个小时详细讲述了睡眠的重要性。

用法提示：expatiate on 表示就某个话题展开详述。

Instead of giving a short answer, he expatiated upon the risks of the plan.

他没有简短回答，而是详细阐述了该计划的风险。

用法提示：expatiate upon 后接话题，意为展开细说。

While expatiating on the benefits of exercise, she forgot the time.

她详细讲述运动好处时，忘了时间。

用法提示：现在分词 expatiating 作状语，表示‘详细讲述’。