foreground 和 forefront 有何区别？

foreground
['fɔ:ɡraund]
n.
(图画等的)前景

最显著的地位; 前台

keep oneself in the foreground 站在前面, 处在最显著的地位
The painter painted in the foreground.
这位画家画出了前景。
This is a photograph of our town, with a church in the foreground.
这是我们城市的照片，前景是教堂。

forefront
['fɔ:frʌnt]
n.
最前部, 最前线; (活动、趣味等的)中心

someone who is the forefront of an important enterprise.
在一项重大事业中最前方的男性。
A new group of singer is coming to the forefront.
一群新歌手正崭露头角。
a woman who is the forefront of an important enterprise.
在一项重大事业中最前方的女性。

前景和前沿