In addition, inside structure of ballast water tank is very complex, shield effect to protective current also becomes a key problem in cathodic protection design.
另外压载水舱内部结构复杂，“屏蔽效应”对保护电流分布的影响也成为阴极保护设计中的关键问题。
The space structure and the whole environment is the key of the protective planning and design of the historical street area.
保护历史街区空间格局，乃至整体环境是保护规划设计的关键所在。
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