This kind of bridge consists of a single beam anchored at one end and extended horizontally like a diving board.

这种桥由一端固定的单梁组成，并像跳水板一样水平延伸。

Then, he positioned a plate with two more tiny slits cut into it, spaced very close together so that the single beam of sunlight passed through them.

然后，他放置了一个盘子，盘子上又切了两个小缝，它们之间的距离非常近，这样一束阳光就可以穿过它们。