求翻译：项目管理是50年代后期发展起来的一种计划管理方式，它一出现就引起举世瞩目。1957年，美国杜邦公司把这种方式应用到设备维修，把维修停工时间由125小时锐减到78小时；1958年美国人在北极星导弹设计中，应用项目管理技术，竟把设计完成时间缩短两年。由于项目管理成效显著，自从60年代以来，它被广泛地应用到各行各业，以及国家和地区政府乃至联合国，它不仅适用于大公司而且也适用于各种小型企业。是什么意思？

Project management is the management style of the late 1950s developed a plan, it appeared to cause remarkable. In 1957, DuPont in this way be applied to equipment maintenance, maintenance downtime dropped from 125 hours to 78 hours; 1958 Americans in the Polaris missile design, the application of p

Project management is developed in the late 50 A Program Management approach, it appears to cause a worldwide attention. In 1957, DuPont of the United States the way the company applied to maintenance of equipment, its maintenance downtime from 1 hour to 78 hours; the Americans in 1958 Polaris missi

Project management was developed in the late 50 's program management, it appeared to cause attracted worldwide attention. In 1957, the United States DuPont applied to equipment maintenance in this way, by 125 maintenance downtime hours dropped to 78 hours; 1958 American Polaris missile design, appl