The streets of Colombian cities were crowded with obsolete buses which operated with disregard for public safety and in near chaos, without organized bus stops.
城市道路挤满了老旧公交车，这些车辆不注意公共安全，运行近乎混乱，而且没有组织有序的公交站点。
Taking safety and convenience into consideration, how should we locate bus stops?
兼顾安全和便利，停靠站点的位置该如何设置？
The present regulating valve core isn't provided with the safety device; the valve is closed by the valve core after a valve rod breaks, causing that the production stops.
现有的调节阀芯无保安装置，阀杆断裂后阀芯将关闭阀门，使生产中断。
The present regulating valve core isn't provided with the safety device; the valve is closed by the valve core after a valve rod breaks, causing that the production stops.
现有的调节阀芯无保安装置，阀杆断裂后阀芯将关闭阀门，使生产中断。
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