在晚会上
in the party
at the party
at the evening party
他突然在晚会上出现了.
He suddenly appeared in the party
在晚会上我们很开心.
We enjoyed ourselves at the party
她在晚会上现编了一首诗.
She improvised a poem at the evening party
昨晚他在晚会上的表演很棒.
His performance at the party last night was very good