1. The professor expounded on the topic expositorily, ensuring that all the students understood the concepts thoroughly.
教授以说明为主地对这个话题进行阐述，确保所有学生都完全理解这些概念。

2. She presented her argument expositorily, providing clear and detailed explanations to support her point of view.
她发表了她的论点，并以解释为主地提供了清晰详细的解释来支持她的观点。