In the year that Zaka was head prefect, relations were particularly strained.
Smaller trade groups have been particularly strained by the rapid pace, lobbyists working on the issue said.
This intervention stimulated cooperation among Italian rulers, including Charles Albert of Savoy, whose relations with Austria had been particularly strained.
Ties have been particularly strained since March 2008, when violence broke out across the Tibetan plateau.
The race has been particularly strained in Qum, as the candidates compete to speak in the city's many mosques and theological schools.
In Prince George's County, where housing revenues continue to fall and a $100 million infusion of federal stimulus dollars has dried up, schools are particularly strained.
The Secret Service has been particularly strained as it tries to keep up with its new protectees, who include a first lady and a son living at Trump Tower and Mr. Trump's frequently traveling adult children.
Relations between Liverpool and United have been particularly strained since Luis Suárez, a Liverpool forward, was found guilty of, and suspended for eight matches for, racially abusing Patrice Evra, a United defender, during a match last season at Anfield.
Relations have been particularly strained between the Catalan regional government in Barcelona and Mr. Rajoy's administration, fueling a long-running argument over the degree of fiscal and political autonomy that Catalonia should be granted.
Relations appear to have been particularly strained between Ms. Betancourt and three American hostages, captured when the plane in which they were flying as part of the American-supported drug interdiction program crashed in 2003.
