horizontal line of sight

基本解释

The ice crystals must be oriented horizontally and the observer's line of sight must be close to horizontal to see the sundogs.
冰晶必须面向水平，而观察者的视线也必须接近水平来观察幻日。
Indeed, horizontal lines are similar to the familiar sight of a horizon line in the distance allowing them to convey a sense of wide-open space.
事实上，横线与熟悉的景物——远方的地平线相似，由此，它们适于传递一种辽阔空旷之感。
A horizontal track system is inlaid into the work surface of the desk, improving the operator's line of sight to monitor walls and giving the console a cleaner appearance.
横向跟踪系统嵌入在桌子的加工面上，这样提高了操作者监控墙壁的视线，还使该控制台显而易见。
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