合成背景操作 请输入合成名称 背景音乐： 添加背景音乐 × 背景闪避音量-值越大背景音量越小 1002468101214161820 合成录音 × 添加背景音乐 选择 本地 点击背景标题选择 舒缓抒情音乐3（礼物） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 伤感舒缓音乐1（假装遗忘） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 清新甜美音乐5（白球鞋） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 清新甜美音乐2（心引力定律） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 清新甜美音乐1（春天物语） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐10（Ukulele Adventure） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐9（Wild Chive） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐8（Funny Whistle & Ukulele Loop） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐8（Children Fun） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐7（公主与小钢琴） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐6（Nature Walk） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐5（夏天到了） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐4（Sunny Days） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐4（Sunny Days） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻松欢快音乐3（Vivaldi Spring 1 Allegro） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻柔舒缓音乐5（Beautiful Piano 6） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻灵欢快音乐3（百分百甜蜜） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻快悠扬音乐2（焦糖暖冬） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 轻快节奏律动音乐1（你最初的） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 流行动感音乐2（惊雷-抒情版） PlayPlayPauseSeek0% buffered00:00Current time00:00Toggle MuteVolumeToggle CaptionsToggle Fullscreen 背景必须是mp3格式，且小于10m 添加背景音乐
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