海平线 meaning in English

sea horizon
sea line
sea rim

The sun in the west was a drop of burning gold that slid nearer and nearer the sill of the world .
西下的夕阳就象一滴燃烧着的金子，一点点滑向海平线。
The mirages had died away and gloomily he ran his eyes along the taut blue line of the horizon .
各种蜃景都已消失了，他郁闷地用眼睛扫着笔直的、蓝蓝的海平线。
They gazed intently at the dense blue of the horizon, as if a little silhouette might appear there at any moment .
大家目不转睛地直盯着深蓝色的海平线，似乎那儿随时都可能出现一个小小的船影。
Studies of the weddell seal in the laboratory have described the physiological mechanisms that allow the seals to cope with the extreme oxygen deprivation that occurs during its longest dives , which can extend 500 meters below the ocean ' s surface and last for over 70 minutes
译：实验室针对威德尔海海豚在海平线500米以下历时70分钟的长期潜水、极端缺氧的状态的研究过程，得出了海豚相关的生理机制。