为什么 ocean 和 ocean of 不一样，他们各有什么含义

ocean ['?u?n]

n.

1. 海洋2. 洋3. [书面语]大海

ocean of 多用比喻义.

It is then that you realize that you are moving through an "ocean of air".

这时，你才意识到你正穿过“空气的海洋”。

Ironically, so too has the ocean of capital sloshing through markets in recent years.

讽刺地是，近年来市场多次使资本的海洋波动不已。

I am a droplet in the ocean of divinity.

我是神性的海洋中的一滴水。

Love is an ocean of emotion, entirely surrounded by expenses.

爱是完全由金钱来包围的情感海洋。

On blue days you feel like you're floating in an ocean of sadness.

在忧郁的日子里，你会觉得自己在悲伤的海洋里沉沉浮浮。

You, like a candle, a weak light illuminated the ocean of knowledge.

你们，像一支蜡烛，微弱的光照耀知识的海洋。

I, as if turned into a white dancing butterfly, am reveling in the Ocean of green!

我，仿佛变成了一只翩翩起舞的白色蝴蝶，陶醉在绿色的海洋中，真美啊！

这是一种比较高级的用法.