他们一边喝咖啡一边轻松地交谈着。

They were having a casually conversation over coffee.

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They were having a casually conversation over coffee.

casually 是形容词 casual 的副词形式,由 casual(随意的、非正式的)加上副词后缀 -ly 构成。casually 表示"随意地、非正式地",形容谈话氛围轻松不拘束。

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