Tours in which his head climbed cliffs, blue sky line;

游在其中，头顶绝壁万仞、蓝天一线；

They form when the sun is near the horizon and ice crystals high in the sky line up in a way that bends the solar rays like a prism.

当太阳靠近地平线，高空中悬浮的冰晶排列起来，就像菱镜一样折射日光，这个时候便形成了幻日。

It firstly extracts several target candidates through the preprocessing including median filtering, edge extraction, sea-sky line detection and morphological filtering of infrared sequence images.

通过对红外序列图像进行中值滤波、边缘提取、海天线检测和形态滤波等预处理，提取出若干个候选目标。

Lightning cuts a jagged line through the evening sky.

闪电在夜空中割出一道锯齿状的线。

When shooting a scene that includes not just the sky but also other elements like a cityscape, keeping the horizon line straight is particularly important.

如果我们拍摄的画面中除了天空，还有一些其它的元素(如城市景观)，使地平线保持水平非常重要。