这一结构被夹在由导电材料制成的具有电极作用的内环和外环之间，整个结构的外围是又一层聚碳酸酯外壳。
This is sandwiched between inner and outer rings of conducting material that act like electrodes, and the whole thing is surrounded by yet another layer of polycarbonate as cladding.
基于网络的培训：为基于既定体系结构的课程创建外壳；设计动画，测验，和其他网络交互。
WBT: Create a shell for the course based on the determined architecture; design animations, quizzes, and other Web-interactions.
飞机的钢结构被用作承重墙，而轻量级的铝外壳和飞机翅膀则被回收利用成屋顶材料和外墙。
The plane's steel structure was used for load-bearing walls, while the light-weight aluminum shell and wings were reappropriated as roofing material and exterior walls.
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