邻居们闻到烧烤的烟味后纷纷自带食物过来，一场即兴烧烤就这样开始了。
An impromptu barbecue broke out when neighbors smelled the grill smoke and brought their own food.
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解释
形容聚会或活动未经计划、临时自发形成。
An impromptu barbecue broke out when neighbors smelled the grill smoke and brought their own food.
形容聚会或活动未经计划、临时自发形成。