经济学

• 壁垒

  Theoretical analysis on standards barriers.

  技术标准壁垒的理论分析。

• 障碍

  The larger migration barriers of labour from rural to urban are, the slower the process of urbanization will be.

  劳动力从乡村向城市的流动障碍越大,城市化的进程越缓慢。

法学

• 障碍

  The forth Part will be expounded barriers of public interest litigation system and its way out.

  第四部分将阐述我国建立行政公益诉讼制度的障碍及其出路。

• 难点

交通运输工程

• 护栏

  A parameter study on dynamics of the car and occupant and the performance of the barriers was carried out. Several important conclusions were drawn out and a new structure of barrier post was presented creatively.

  通过改变不同的仿真参数(碰撞条件)，深入研究碰撞中轿车和乘员的动态响应和护栏的碰撞特性，得出了若干重要的结论并创造性地提出了一种新的护栏立柱结构。

地球科学

• 沙坝

• 沙堤