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。
The first, concave concrete form of the entry facade welcomes all the users serving as a barrier protect the building and the terrace garden behind from excessive heat and sun light.
第一，是入口处内凹的混凝土形式，作为一个屏障保护建筑，避免背后的露台花园过热和太阳光。
应用推荐