绕着光涡旋的黑暗中心，光束携带的能量流就像螺旋梯，沿着顺时针或者逆时针方向流动。
Around the dark core of an optical vortex, the energy flow carried by the light beam is like a spiral staircase, flowing in a clockwise or counterclockwise direction.
就涡旋光束和光学涡旋的基本特征和原理进行了概述，对其产生、传播及应用进行了介绍。
The basic principle, generation, transformation and application of optical vortex beams and optical vortices are briefly summarized, as well as their progress.
但面对日益增长的多源、大面积海洋遥感数据，在快速自动化提取海洋涡旋的空间信息方面还存在很多难题。
However, with the blowup of multi-source and large region covering ocean remote sensing data, there are still many difficulties in fast and automatic extraction of spatial information of ocean eddies.
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