世界各国新闻事业发展的历史和现状
The development history and current situation of the world of Journalism
文摘：介绍离子式电推进的工作原理、性能参数、发展历史和现状。
Abstract: the operation principle, performance parameters, developing history an d status of ion propulsion are introduced.
阐述铁路站段多经企业发展的历史和现状,揭示站段多经企业与站段的依附关系,分析站段多经脱。
Elaborate railroad to stand many paragraphs of history that develops via the enterprise and current situation, announce stand enterprise of many paragraphs of classics and station paragraph depend on relation, the analysis stands the difficulty of unhook of many paragraphs of classics.
如有疑问请继续追问，望采纳，谢谢，您的采纳是我的力量！
追问世界各国用world 代替准确吗？不是countries aroud the world 吗？没有怀疑您的意思，我就是想再肯定一下
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