这样一来，窥视者在其他角度看过去，由于眼睛接收不到来自屏幕的光线，看上去仿佛屏幕根本没有点亮，从而实现宏观的防窥的效果。
The bandwidth problem
。WPS官方版本下载是该领域的重要参考
Full Moon - The whole face of the Moon is illuminated and fully visible.
It was dramatically extended after the spacecraft Butch and Suni had used to travel to the International Space Station suffered technical problems.
Four people aboard were killed in the 1996 incident, triggering outrage in the US.