在继续学习之前，您应该阅读本系列的前面的文章。
Before proceeding, you should read the previous articles in this series.
在电脑时代之前，记账人都是坐在桌子边，对着前面的两瓶墨水。
Before the age of computers, bookkeepers sat at their desks with two bottles of ink in front of them.
当相机设置了定时器时，前面的液晶屏会显示倒数计时，在照片拍摄完成之前显出“3、2、1”的字样。
And when the camera's timer is set, the outer display counts down, showing '3, 2, 1' until the image is captured.
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