'What is that level line of little sparkles—a town, I suppose'?

“那条小火花的水平线是什么——我想是一个城镇”？

Mappers and builders use laser technology every day. For example, drawing a perfectly level straight line on a construction site is easy using a laser.

绘图员和建筑商每天都在使用激光技术。 例如，使用激光很容易在建筑工地上绘制一条完美水平的直线。

Where the Duke pointed, crescent dune tracks spread shadow ripples toward the horizon and, running through them as a level line stretching into the distance, came an elongated mount-in-motion—a cresting of sand.

在公爵所指的地方， 新月形的沙丘轨迹向地平线散布阴影涟漪，穿过它们作为一条延伸到远处的水平线， 出现了一个细长的运动山——沙顶。