We had a sparkling conversation that lasted well into the night.

sparkling 是动词 sparkle 的现在分词形式作形容词使用。sparkle 本意是"闪耀、发光"，引申为"充满活力、妙趣横生"的意思。 sparkling conversation 指"妙趣横生、充满智慧的对话"，形容谈话内容精彩生动，就像闪闪发光的宝石一样吸引人。