英语翻译

英语翻译
Current trends,however,pose questions about the future of the profession.These questions concern the role that civil engineers play—and could play—in society in addressing the ultimate integrity of the world’s infrastructure and ensuring the health of the natural environment.Civil engineers find themselves keepers of an impressive legacy while they simultaneously raise concerns about their future.They know they must demonstrate leadership; they know they must control their own destiny rather than allow events to control them.
是关于土建行业未来的,主要是Civil engineers find themselves keepers of an impressive legacy while they simultaneously raise concerns about their future.这句中的 an impressive legacy 怎么翻译