How can Amazon deliver your toothpaste with a drone if it has to stay within eyeshot of a pilot?

如果无人机不能飞入飞行员视线之内，亚马逊还如何用无人机配送你的牙膏？

A study by the University of Texas has suggested that just having a smartphone within eyeshot can reduce productivity, slow down response speed and reduce grades, as the eyes of the students keep being drawn away from their work.

德克萨斯大学的一项研究表明， 仅仅将智能手机放在视线范围内会降低工作效率， 降低响应速度并降低成绩，因为学生的眼睛不断从他们的工作上移开。