to-and-fro movement meaning in Chinese
来回摆动
往复运动
Examples
- The tidal current in the radial sandbanks area apparently has directional to - and - fro movement , which can be observed not only from tidal ellipses , but also from water particle traces . the calculated distribution of tidal velocity in this area shows that the average velocity is around 0 . 6 to 1 . 0 m / s
平面潮流椭圆、水质点迹线、潮流流速特征研究表明，辐射状沙脊群海域潮流具有明显的定向往复流形式，平均潮流流速一般为0 . 6 1 . 0m s ，满足形成潮流沙脊的水动力条件。 - Through studing the plane and vertical hydromechanical characteristics in the radial sandbanks area , the mechanisms of the formation , maintenance and asymmetrical distribution of the radial sandbanks are understood . it ' s well known that the directional to - and - fro movement and strong tidal current are the necessary dynamic conditions for the formation of tidal current sandbanks
通过对辐射沙脊群海域平面及立面动力特征的研究，基本探明了南黄海辐射沙脊群形成发育和维持的水动力机制，以及其不对称分布格局与动力因素的内在联系。