n.压缩扩展，展缩
The mother is companding her child to study at summer night.
夏夜里陪孩子读书的母亲.
An auto - companding technique on analog circuit behavioral modeling based on wavelet collocation method is proposed.
提出了一种新的自动压扩方法,适用于基于子波配置方法的模拟电路行为级建模.
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