1. The sun sank below the horizon.
    太阳已落到地平线下.

2. He scanned the horizon, looking for land.
    他细看天水相连的地方, 寻找陆地.

3. A ship appeared on the horizon.
    船出现在水平线上.

4. Fortunately for me, as I was wondering what to do next, there appeared on the horizon a man on horseback, riding in my direction.
    不过，我是幸运的，正当我走投无路之时，从天边出现一个骑马的人向我骑来。