The unclear property of collective-owned land and its structuralasymmetry are one reason causing enclosure movements.
集体土地的产权边界模糊及其产权结构的非对称性，是产生圈地运动的根源之一；
2
The structural characteristics of the system are the origin of creating scanning nonlinearity and asymmetry.
系统本身的结构特点是产生扫描非线性和非对称性的根源。
3
By inducing the measurements of recession degree, we have tested the asymmetry in quarterly real GDP data of China's economy, and showed that it is caused by the nonlinear structural model.