定期巡检气站，保证运行的安全和可靠性。
Patrol regularly for all the gas stations, ensure the safety and reliable of operation.
城市轨道交通系统的运营安全和可靠性是必须面对的一个重要问题。
Today, operation security and reliability of urban mass transit system becames an important problem one has to face.
记住非常重要的一点，如果你对头盔有疑问，怀疑其安全和可靠性，请立即更换，请经常检查您的头盔。
Remember that it is important, if you have questions about helmets, doubt the safety and reliability, please replace soon, please always check your helmet.
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