In fact, renormalization is the major obstruction to making path integrals well-defined.

There are no major obstructions of the North section of the trail in the form of missing or unsafe bridges.

The trail is clear of any major obstructions and is followable on foot, but would be difficult even for a mountain bike.

We had to cross a major obstruction that ran east west across this part of the country.

Any number of vehicles trying to pick up the finishers will have great difficulty parking and will probably cause a major obstruction.

"The point is, he didn't stand as a major obstruction, and those are all sort of backhanded compliments, but he deserves them, I think."

Even with elevated cholesterol, he's young for a major cardiovascular obstruction, don't you think?

The stores up ahead were dark, but at least the deck itself had been cleared of major obstructions.

Floods, however, are a major obstruction in the development of this sector.

Outside the tunnel wall, no polyponds or major obstructions visible.