它的定义简单而自然，我们知道它许多优美的构造，然而也有大量的问题尚未解决。
The definition of an orthogonal array is simple and natural, and we know many elegant constructions-yet there are at least as many unsolved problems.
关键点是虽然电极和电解质显然是固态的，它们事实上却具有完美的纳米(一纳米即十亿分之一米)构造。
The crucial trick is that although both the electrodes and the electrolyte appear solid, they are actually finely structured at the nanometre scale (a nanometre is a billionth of a metre).
把信息组织在一个构造精美的布局里是一个网站的根基，应该在考虑风格设计之前弄清楚。
Organizing information into a well-built layout is the basis of a website, and should always come before styling concerns.
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