發送短信 : Gradual resumption on in-person classes

 _    _      ___     _    _    __   __    _  _   
| \  / ||   / _ \\  | || | ||  \ \\/ //  | \| || 
|  \/  ||  | / \ || | || | ||   \ ` //   |  ' || 
| .  . ||  | \_/ || | \\_/ ||    | ||    | .  || 
|_|\/|_||   \___//   \____//     |_||    |_|\_|| 
`-`  `-`    `---`     `---`      `-`'    `-` -`