While American officials have periodically threatened to bring a trade complaint against Airbus, their European counterparts have threatened to complain about American actions.

The empire was advantageous to some tribes, who were periodically threatened by other Native Americans, such as the Monacan.

Congressmen have periodically threatened to do that, but no serious effort ever has been undertaken.

A year after that meeting, the Administration is still negotiating, and, while it has periodically threatened sanctions, it has never invoked them.

For this reason, human habitations in Big Sur are periodically threatened by fire.

Steinbrenner also periodically threatened privately to sue the commissioner.

But the political opposition had its doubts, in part because officials had also periodically threatened to change their minds about lifting the restrictions if there were a resurgence of leftist guerrilla violence.

It would have certified Canadian unity, periodically threatened by Quebec separatists.

It has never developed a weapons system it did not ultimately sell on the world market, and it has periodically threatened to sell its nuclear technology.

Dr. Heagarty, who relishes a good fight, is prepared to take on anyone who would think of shutting down the hospital - something that is periodically threatened.