识别5个用于提高公共演讲的在线资源。
1. Toastmasters International - https://www.toastmasters.org/
2. MsScribeSpeaks - www.mscribespeaks.com
3. YouTube - www.youtube.com
4. Coursera - www.coursera.org 
5. SpeechTools - www.speechtools.io