發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Broadband ultrasonic focusing in water with an ultra-compact metasurface lens