已知要求的边界尺寸大小及安装空间，他们允许设计师采用滚动轴承横跨整个范围进行工程应用。
Known boundary dimensions indicate the required size of the mounting space and they allow designers to use rolling bearings across the whole range of engineering applications.
公司的发言人丁智勇（Ding Zhiyong音译）透露说，集团公司旗下13家子公司正在全球范围内寻求胜任副总的人才，要求能在市场营销、研究设计和生产方面具有跨国航空制造商背景及丰富经验。
AVIC is looking for vice presidents for 13 subsidiaries who have experience at multinational companies in marketing, research and production, said Ding Zhiyong, a company spokesman.
为防止进一步的环境侵害，垃圾填埋场附近范围的土地及地下水均被要求进行处理。
To prevent further environmental damage, both ground and groundwater in the vicinity of these landfills often require treatment.
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