周期性地

In eastern China, transgression occured periodically during Eogene, and formed specially paleobio-cenosis,mineral association and rock type.

中国东部早第三纪沉积演化过程中曾周期性地发过海侵,从而形了具有海相特征的岩石类型、物组合。

Economic crises recur periodically.

经济危机周期性地发。

The geyser erupts periodically.

间歇泉周期性地喷发。