The most substantial hurdle remaining is the continued government ownership, analysts said.

This project also faces substantial hurdles, including well-organized community opposition.

A substantial hurdle is the difficulty of working out fossil ages.

And even under the new law, Soviet citizens trying to leave would face substantial hurdles.

In 1992, the tribe's 14-year effort to win Federal recognition and reclaim its reservation faced substantial hurdles.

A substantial hurdle to this aim is the difficulty of working out how old fossils are.

However, the two substantial hurdles which protect the Fund mean many people will not benefit.

But the talks will have to overcome substantial hurdles.

But for Pharmacia to win market share, it will have to overcome substantial hurdles.

There are substantial hurdles, including public perception, to establishing a transportation network using the new jets.