地下边界根据电磁波在导电媒质中快速衰减的特性设定，将改进的完全匹配层用于空中边界。
The subsurface boundary condition is determined by behavior that electromagnetic waves attenuated in the earth, and the modified perfect match layer is for air boundary.
以色列又在哪里，他们和叙利亚有一段边界，以色列给叙利亚来次空中打击小菜一碟。
Where is Israel? Israel shares a border with Syria. Israel has no problem flying air strikes on Syria.
仪表（云中）飞行空域的边界距离航路、空中走廊以及其他空域的边界，均不得小于10公里。
The horizontal separation between the limits of instrument (in clouds) flight airspace and those of the airways, air corridors and other airspace shall not be less than 10 kilometres.
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