horizon
/həˈraɪzn; hə`raɪzn/ n
1 the horizon [sing]
the line at which the earth and sky appear to meet 地平线
The sun sank below the horizon. 太阳已落到地平线下.
A ship appeared on the horizon. 在天水交接处出现了一艘船.
2 [C usu pl 通常作复数]
(fig 比喻) limit of a person's knowledge, experience, interest, etc （知识、 经验、 兴趣等的）范围, 见识, 眼界
a woman of narrow horizons 眼界狭小的女子
Travel broadens one's horizons. 旅行可开阔人的眼界.
3 (idm 习语) on the ho`rizon about to happen; just becoming apparent; imminent 即将发生的; 已露端倪的; 临近的
There's trouble on the horizon. 很快就会出事.