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Sunglasses allow better vision in bright daylight, and may protect one's eyes against damage from high levels of ultraviolet light. Typical sunglasses are darkened for protection against bright light or glare; some specialized glasses are clear in dark or indoor conditions, but turn into sunglasses when in bright light. Most sunglasses do not have corrective power in the lenses; however, special prescription sunglasses can be ordered. Specialized glasses may be used for viewing specific visual information (such as stereoscopy) or 3D glasses for viewing three-dimensional movies. Sometimes glasses with no corrective power in the lenses are worn simply for aesthetic or fashion purposes. Even with glasses used for vision correction, a wide range of designs are available for fashion purposes, using plastic, wire, and other materials.
Three, in addition to the public security police arrest the criminal suspect, hit the highwaymen, maintain traffic order and deal with traffic accidents, any other personnel shall not flow to check on the road, not intercept in normal running vehicles on the road, passengers should not be subject to the implementation of personal checks.
Maintenance operations within a specified time period, the station attendant in after completion of maintenance work pin down should immediately report to train dispatcher, train dispatcher release maintenance job no longer end restore traffic command. If you need to extend the operation time, the train dispatcher will issue the dispatch order approval.
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