The 2N-pole fields are generated by 2N identical, symmetrically-arranged in azimuthal direction electrodes of circular concave form, whose potentials are Vo and -Vo alternately.
凹形圆弧偶端电极场是由偶数（2N）个对称地放置在方位角方向上、并具有一定电位的同样的凹形圆弧电极所产生的电场。
This crescent-shaped ridge of sand dune in Oman was formed by strong trade winds that form a smooth hill facing the wind (left) and concave slipface on the back.
阿曼一座新月形的沙丘脊由强信风吹成，在迎风的方向（图左侧）形成一面平缓的凸破，在背风面形成凹坡。
Align the ring-form concave of pressing jaw with the rim on press-fitting, in groove of which a rubber ring is mounted, and compress it bv pressing tools.
把卡压工具钳口的环状凹部对准管件端部内装有橡胶圈的环状凸部进行卡压。
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