bold relief meaning in English

粗糙地形

The snowy alps stand out in bold relief against the blue sky .
白雪皑皑的阿尔卑斯山在蓝色天空的衬托下鲜明地耸立着。
In trumbull ' s historical pictures , the chief figures stand out in bold relief
在特朗布尔的历史画中，主要人物显得特别突出。
They were within fifteen miles of monte cristo when the sun began to set behind corsica , whose mountains appeared against the sky , showing their rugged peaks in bold relief ; this mass of rock , like the giant adamastor , rose dead ahead , a formidable barrier , and intercepting the light that gilded its massive peaks so that the voyagers were in shadow
当他们离基督山只有十五哩的时候，太阳开始沉落到科西嘉的后面，科西嘉的群山在天空的衬托下划出明晰轮廓，雄劲地呈现出峥嵘的山峰。这座大岩山象巨人亚达麦斯脱似的气势汹汹地俯视着小船，遮住了太阳，而太阳又染红了它的山巅。