open up:
(1) to show something that was hidden or not previously known:
The debate could open up sharp differences between the countries.
这次辩论能够揭露这些国家之间的明显差异。
(2) to make a space larger or less enclosed:
We’re going to open up our kitchen by knocking down a couple of walls.
我们打算把墙壁推倒来扩大我们的厨房。