导游开始详细讲解大教堂的建筑历史，游览因此推迟了一个小时。
The guide began to expatiate on the cathedral's architectural history, and the tour ran an hour late.
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解释
expatiate 是动词，意为“详述、长篇大论”，指对某个话题进行冗长而详尽的阐述。
The guide began to expatiate on the cathedral's architectural history, and the tour ran an hour late.
expatiate 是动词，意为“详述、长篇大论”，指对某个话题进行冗长而详尽的阐述。