核心通过制度化的多边合作机制联系着周边国家，但从核心到边缘存在着等级区别。
The two cores are linked with peripheral states with institutionalized multilateral cooperative mechanisms, but there is a hierarchical difference between the core and periphery.
对此活动范畴的尊重正意味着对人之为人的生存方式的坚持，三种活动之间不仅存在着联系还存在着明确地等级区别。
This activity view respect is meant for human survival way adhere, three kinds of activity between not only the existence of links also exist clear class distinction.
E 级和 A 级空域的区别在于，在 A 级空域，所有操作都需遵照仪表飞行规则，飞行员必须要有仪表等级，也就是说，要有操作航空仪表方面的技术和执照。
The difference between Class E and A airspace is that in Class A, all operations are IFR, and pilots must be instrument-rated, that is, skilled and licensed in aircraft instrumentation.
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