English Version\n1. Overview\nMusicDownloader is a software application developed with Python and PyQt5 that provides search, playback, and download functionality for FLAC lossless format music (default) and MP3 format music (optional).\n2. Main Features\n\u2022\tSearch Music: Search for songs by name or artist\n\u2022\tPlay Music: Add songs to playlist and play them\n\u2022\tDownload Music: Download selected songs in FLAC or MP3 format\n\u2022\tPlaylist Management: Create and manage playlists\n\u2022\tMultiple Themes: Choose from different interface themes\n\u2022\tBilingual Support: Switch between English and Chinese interfaces\n3. Interface Layout\n(1).\tTop Section: Search box, search button, history dropdown, format selection, theme selection, language selection\n(2).\tLeft Panel: Search results table with checkboxes for selection\n(3).\tRight Panel: Playlist display and management\n(4).\tBottom Section: Player controls, progress bar, volume control, download progress\n4. Basic Operations\n4.1 Searching for Music\n(1).\tEnter a song name or artist in the search box\n(2).\tClick the "Search" button or press Enter\n(3).\tResults will display in the table with song name, artist, album, and duration\n4.2 Playing Music\n(1).\tCheck songs in the search results\n(2).\tClick "Add to Playlist" button\n(3).\tDouble-click a song in the playlist to play it\n(4).\tUse playback controls: Play/Pause, Stop, Previous, Next\n4.3 Downloading Music\n(1).\tCheck songs in the search results\n(2).\tSelect download format (MP3 320K or FLAC Lossless)\n(3).\tClick "Download Selected" button\n(4).\tMonitor download progress in the progress bar at the bottom\n4.4 Managing Playlist\n\u2022\tAdd songs: Check songs and click "Add to Playlist"\n\u2022\tRemove songs: Right-click a song in playlist and select "Delete Song"\n\u2022\tClear playlist: Click the "Clear" button above playlist or use File menu\n\u2022\tPlay modes: Select from Sequential, Shuffle, or Loop playback\n5. Settings & Customization\n5.1 Language Selection\n\u2022\tUse the language dropdown (English/\u4e2d\u6587) in the top right\n\u2022\tOr use Language menu in the menu bar\n\u2022\tDefault language is English\n5.2 Theme Selection\n\u2022\tChoose from: Default Theme, Dark Theme, Blue Theme, Green Theme, Yellow Theme\n\u2022\tSelect from theme dropdown in top section\n5.3 Download Format\n\u2022\tMP3 320K: Standard quality, smaller file size\n\u2022\tFLAC Lossless: Highest quality, larger file size (default)\n5.4 Save Directory\n\u2022\tDefault: User's Music folder\n\u2022\tChange via: File \u2192 Set Save Path\n6. Menu Functions\nFile Menu:\n\u2022\tSet Save Path: Change where downloaded music is saved\n\u2022\tClear Search History: Remove all search history\n\u2022\tClear Playlist: Remove all songs from playlist\n\u2022\tExit: Close the application\nLanguage Menu:\n\u2022\tEnglish: Switch to English interface\n\u2022\t\u4e2d\u6587: Switch to Chinese interface\nHelp Menu:\n\u2022\tInstructions: Show this user manual\n\u2022\tAbout: Show application information\n________________________________________\n\u4e2d\u6587\u7248\u672c\n1. \u6982\u8ff0\n\u97f3\u4e50\u4e0b\u8f7d\u5668\u662f\u4e00\u6b3e\u4f7f\u7528Python\u548cPyQt5\u5f00\u53d1\u7684\u8f6f\u4ef6\u5e94\u7528\u7a0b\u5e8f\uff0c\u63d0\u4f9bFLAC\u65e0\u635f\u683c\u5f0f\u97f3\u4e50\uff08\u9ed8\u8ba4\uff09\u548cMP3\u683c\u5f0f\u97f3\u4e50\uff08\u53ef\u9009\uff09\u7684\u641c\u7d22\u3001\u64ad\u653e\u548c\u4e0b\u8f7d\u529f\u80fd\u3002\n2. \u4e3b\u8981\u529f\u80fd\n\u2022\t\u641c\u7d22\u97f3\u4e50: 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