在担任世界遗产大会管理工作的十余年里，协调了世界几大重要城市的多个重大保护项目。
He managed the world Heritage Convention for over 10 years, coordinating several important conservation projects in the most important sites in the world.
在国际卫星系统起步后的二十余年里，技术的进展使全世界卫星传输系统发生了重大的变化。
In the past decades since the start-up of the Intelsat system, technology developments have led to considerable changes in the world-wide satellite transmission system.
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