Similar cases have occurred periodically in other parts of China.

Most episodes last several days and occur periodically throughout life.

Such warfare has occurred periodically for the past four centuries.

In India, incident of religious violence have periodically occurred since independence.

T And's variability occurs periodically, with the period calculated at 280.1 days.

Included should be a plan for dealing with world oil gluts that can occur periodically.

Such a scene, calculated for effect, occurred periodically in houses of the great nobility.

Earthquakes with similar magnitudes have occurred in this region periodically, about every 40 years.

Clashes between supporters of the two coalitions have occurred periodically.

Still, major scandals occurred periodically, and many of the posts remained vacant.