It comprises of four parts, namely: flow limitation hole, focus ring, electrode ring and nozzle.
它包括四个部分：限流孔、聚焦环、电极环以及喷嘴。
But the survival problem of optical network is still the focus of city rail transit, especially studying and using the ring optical network.
但是光网络的生存性问题仍旧是城市轨道交通关注的焦点，特别是对环形光网络研究和应用。
Focus locking system has been changed from point fixing to surface fixing utilizing a ring and internal mechanical structure designed for high vibration resistance.
对焦锁定系统已经从点固定改变为面固定，其原理是利用一个圆环及内部为高抗震性而设计的机械结构来实现的。
This drill helps seimmers focus on stroking correctly while ring jrst one arm at a time.
这一练习有助于运动员集中注意力于一臂的划水动作上。
The aperture field distribution of the ring focus antenna is reviewed in view of the energy conservation law, and the simple formula for calculating its radiation pattern is deduced.
该文从能量守恒观点出发，讨论了副面为椭圆的环焦天线的口径场分布，并导出了计算其方向图的简单表达式。
As Paula closes her eyes and tries to focus, her landline and cell phones ring almost simultaneously.
当Paula闭上双眼，努力要集中注意力的时候，她的固定电话、手机几乎同时响了起来。
At present, the ring rolling technology roll one ring in one process, and the technology can't deal with stress focus on the sharp taper Angle of mandrel roller.
目前锥形套圈辗扩技术只能一次成形一件，而且由于锥形套圈锥角使得芯辊应力集中严重。
The annular aperture of typical mirror lenses results in out-of-focus images with a pronounced 'bright ring' effect.
典型反射镜头的环状光圈导致失焦影像呈现明显的“亮环”效应。
The annular aperture of typical mirror lenses results in out-of-focus images with a pronounced 'bright ring' effect.
典型反射镜头的环状光圈导致失焦影像呈现明显的“亮环”效应。
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