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。

Now he could focus his attention on examining the strange ring.

现在他可以集中注意研究这枚戒指了。

As his personal life spiraled out of control, Tyson lost his focus in the ring.

由于私人生活严重失控，泰森无法再专注于拳击场上。

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。