To sum up, in the late primitive society to the xia, shang and zhou era is the main currency form physical currency, has a wide circulation is natural.
综上所述，原始社会后期至夏、商、周时代主要货币形态是实物货币，流通较广的是天然贝。
2
The evolution and enhancement of occluded frontal circulation in upper-level westerly jet and lower-level southerly jet are discussed by using a dry primitive equation model.
利用原始方程模式探讨了高空西风急流和低空南风急流中锢囚锋环流的演变和增强机制。
3
The wintertime circulation in the South China Sea (SCS) has been simulated by using a three-dimensional, primitive-equation model with a free surface.