From the outset, it should be noted that shielding problems are always rational and do not involve the occult; but they are not always straightforward. Each problem must be analyzed carefully.

首先需要明确：虽然屏蔽设计总是可以借助理论来进行，并不神秘，但是，在处理实际问题时不能生搬硬套，而要注意具体问题要具体分析。