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。
The wheel band pre-installation used snap ring is wholly buckle installed in the groove of the wheel band relative to the rail car wheel.
所述的轮箍预装用卡环，其整体扣装在轨道机车轮对的轮箍的沟槽中。
The smooth transition between circle and square occurs at the same time as the ring rail made of platinum describes a three-quarter twist.
圆形和方形之间的平稳过渡为白金制成的，描述了三季度扭在同一时间。
The smooth transition between circle and square occurs at the same time as the ring rail made of platinum describes a three-quarter twist.
圆形和方形之间的平稳过渡为白金制成的，描述了三季度扭在同一时间。
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