The capillary images were projected on a focusingscreen. It is of much benefit in observing the dynamic behaviors of the microcirculation continuously and quantitatively.
该装置可将毛细血管的像聚焦在一光屏上，它有利于连续与定量观察微循环的动态特性。
2
You simply watch a grid of letters that flashes on the screen, focusing on the letter you want to type.
你只要简单地看着屏幕上闪现的一组字母，集中注意力在你想要输入的字母上。
3
Focusing on a computer screen for too long can lead to dry eyes and eye fatigue.