This might seem like the blind leading the blind - and it's hard to imagine parents at an Open Day being impressed by a university offering 5 zero contact hours.

这看起来就像外行指导外行一样，很难想象父母们会在校园开放日，对一所提供零面授课时的大学留下深刻印象。

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The snag, however, has been that while efficiency is good at close contact, it can drop to zero at even a few millimetres from the transmitter.

一个意料外的障碍是，尽管在相当近的距离内传输效率很高，可一旦和传输器的距离达到几毫米，效率就会跌到零。

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The next section of code, the for loop, first retrieves all the childNodes of the first contact, when the variable j is initialized to zero.

接下来的一段代码是一个 for 循环，当变量 j 被初始化为 0 时，该循环首先检索第一个联系人的所有 childNodes。

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