边界扫描技术越来越重要了，这大家都明白，但它是如何工作（原理）的呢？想必不是每一个人都明白的。现在这个能帮助大家学习边界扫描。- The boundary scanning technology has been more and more
important, this everybody understood, how but is it works (principle)?
Thought is not each people all understands. Now this can help
everybody to study the boundary scanning.