How to send an invitation letter to the defense expert?

Dear xxx: Our company will hold a seminar on xx on X, X, and we invite you to attend. Your presence will be our honor.

2. Introduction of Short Message Service (SMS): It is a part of unified communication service plan. Users can directly send or receive text or digital information through mobile phones or other telecommunication terminals. The number of characters that users can receive and send short messages at a time is 65,438+060 English, numbers or 70 Chinese characters. Short message is a telecommunication service in digital mobile communication system. It is a non-real-time and non-voice data communication service to transmit text or digital short messages through the signaling channel and signaling network of mobile communication system.