A number of theories have been advanced to explain this episode.
Four types of explanation have been advanced to explain this state of affairs.
Various theories have been advanced to explain the movement from one stage to the next.
Several theories have been advanced to explain acupuncture's effectiveness in this regard.
A number of theories have been advanced to explain the regional differences, Dr. Jaffe of the C.D.C. said.
Many theories have been advanced to explain British TV's recent obsession with period drama in series' such as Downton Abbey, Mr Selfridge, Wolf Hall, Poldark.
Judge Crater disappeared in the summer of 1930, and every imaginable theory has been advanced to explain what happened to him.
Various hypotheses have been advanced to explain the phenomenon, such as those based upon the piezoelectric property of crystalline quartz, but the mystery remains unsolved.
Over the centuries, various theories have been advanced to explain the origin of alphabetic writing, and, since classical times, the problem has been a matter of serious study.
Many explanations have been advanced to explain this "Natchez paradox," but the problem probably originated in the inaccuracies or incompleteness of the original French sources.
As Karen DeYoung, an associate editor of The Washington Post, notes in her new biography, various theories have been advanced to explain Mr. Powell's decision to quietly stick out his first-term tenure as secretary of state.
