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Happy Corporate Summer Acoustic
https://elements.envato.com/happy-corporate-summer-acoustic-Z34V8T5
Free
Upbeat Happy Rock with Whistle & Heys
https://elements.envato.com/upbeat-happy-rock-with-whistle-heys-2B3RSPK
Free 
Startbiz – Powerpoint Template
https://elements.envato.com/startbiz-powerpoint-template-WHFC4YC
Free
Inspiring Documentary Slideshow Background
https://elements.envato.com/inspiring-documentary-slideshow-background-KAXZFVU
Free 
Chare – Creative Digital Powerpoint Template
文件下载,https://downloads.cgguy.com/d/vianetsp/Preview/11ppt/2022/05/17/44698.721840278/cgguy.com_PND55T4.zip
Free
Upbeat Energetic Hopeful Folk
https://elements.envato.com/upbeat-energetic-hopeful-folk-GMFHXZQ
Free 
Calorina – Presentation Template
文件下载,https://downloads.cgguy.com/d/vianetsp/Preview/11ppt/2022/05/24/44705.788738426/cgguy.com_F3W7R9H.zip
Free