The boats are anchored at regular distances and they carry the weight of the bridge.

这些船会以一定的间距抛锚，然后承担起桥的重量。

At regular distances half circles are cut in the upper edge.

在上边缘以规则的距离切割半圆。

Something that is " checkered" is basically a grid-like pattern, where you have vertical and horizontal lines crossing each other at regular intervals (at regular distances), so that you end up with these little squares.

“方格” 的东西基本上是一个类似网格的图案，垂直线和水平线以规则的间隔（以规则的距离）相互交叉， 所以你最终得到这些小方块。