生产过程的一个限制是通常要求提供一个平整的、隐蔽的面。
The limitation of the process is that it generally requires one flat, unexposed side to the design.
美国设置TBT是有原因的，一方面，TBT由于其名义上的合法性和隐蔽性开始被各国特别是发达国家所广泛运用。
Us establishes TBT to have the reason, on the one hand, TBT because in its name validity and the hiding starts by the various countries specially is the developed country widespread utilization.
另一方面，由于其本身具有非常强的隐蔽性，一旦其被黑客用来进行网络嗅探，则会给以太网的安全带来极大的隐患。
On the other hand, as its born quality of concealment, once it is used by some crackers, it will result in many security problems.
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