Early Shang Dynasty thought was based upon cyclicity.

商代早期的思想是根据旋回。

Sequences tend to show cyclicity of changes in relative sea level and widespread unconformities, processes of sedimentation and sources of sediments, climate and tectonic activity over time.

层序多显示相对的海平面以及广泛分布的不整合，沉积作用的过程，沉积物的来源，气候和构造活动等随地质时代变化的旋回性。

The activity trend of shallow and deep earthquakes in Northeastern China before 2005 has been estimated in this paper according to seismic natural cyclicity and astronomical period incident etc.

从地震活动时间序列的自然节律和地震天文周期等方面，对2005年以前东北地区浅震和深震的趋势，作了分析和预测。