But changing the system still faces substantial obstacles.

There were substantial obstacles, such as raising money and finding a sizeable piece of property.

He denied that his peace efforts had run into substantial obstacles.

The delay has posed the last substantial obstacle to the prospect of formal negotiations starting between the Government and the congress on a new constitution.

This stretch of the trail is in flat terrain with no substantial obstacles.

The initiatives vary widely and face substantial political obstacles.

One of the most substantial obstacles to change is the religious panel called the Guardian Council.

In the Senate, Democrats still face substantial obstacles to capturing the six seats they need to win control.

Nevertheless, researchers say women still face substantial obstacles to achieving full equality with men.

Hawaii's high mountains present a substantial obstacle to the trade winds.