In theory, the Army could use such a system to approach targets covertly and drill through concrete, steel, wood, or other materials from a stand-off distance equal to the length of a football field.
理论上，美国陆军将利用该系统实现某些目标，既通过远距离(超过一个足球场的距离)的设备对混凝土、钢铁、木头以及其他材料进行隐蔽的击穿作业。
New system economics' interpretation of educational economic function opens up a wider field for the research of educational theory.
新制度经济学对教育经济功能的解释为教育理论研究打开一个更为广阔的领域。
Western developed countries(regions) has established a perfect system for the qualification of the company representative, company law theory has become an important research field.
西方发达国家（地区）建立了完善的公司代表人资格制度，已成为其公司法理论中的一个重要研究领域。
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