如果您以前从未接触过叠加这个概念，那么它可能有点儿令人困惑。
If you've never been exposed to this concept of superposition before it can be a little confusing.
上面的插图是一幅概念图片，显示了戴上这种眼镜会看到的情景：画面上叠加了一个字母E。
The illustration above is a concept image showing what it would look like with the lens displaying a digital overlay of the letter E.
与一般方法不同，本文利用电通量概念及电场叠加原理，推导出电场能量密度的普遍表达式。方法简明。
This method is different from usual method, we use the concept of electric flux and principle of superposition for the electric field.
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