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1·Forgive me to use this sad incidental music. I know you will say that word already. But, it's my best feeling of this time.

原谅我用这么悲伤的歌曲吧，我知道你可定还得说那句话，但是只有这样才是我最好的感觉。

2·Fashion show is a comprehensive art form the incidental music, which is used in fashion show, are specially composed or selected for fashion show and therefore an inalienable part of this art.

服装表演是一门综合性的艺术，服装表演中的音乐是指为服装表演制作或选配的音乐，是这门艺术的组成部分。

3·The playing of music proved to be incidental to the main business of the evening.

音乐演奏结果只是当晚主要活动的陪衬。《柯林斯英汉双解大词典》