Using potential energy curve, one resonance oscillation with concise, simple and rememberable characteristics is discussed.

用势能曲线讨论一维谐振动，具有简明、生动、易记等特点，可在教学中介绍给学生。

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Stick to a uniform pattern (sort=alpha&dir=desc for instance) and you’ll make sorting and filtering via the URL bar easy and rememberable.

坚持一种统一的模式（比如说sort=alpha&dir=desc ），你就会把通过URL栏进行的排序和过滤变得简单易记。

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