expatiate

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.

她能对市场里每一种蔬菜的营养价值侃侃而谈。

She could ___expatiate at length about the nutritional value of every vegetable in the market.

每当有人提到气候政策，我叔叔就会滔滔不绝，直到桌上每个人甜点都吃完了。

Whenever someone mentions climate policy, my uncle will ___expatiate until everyone at the table has finished dessert.