The method uses a new signal model, that is, the signal components are supposed to have a constant shape while their amplitudes vary across the traces.

首先采用一个新的信号模型，即假设信号具有相同的形状，但具有不同的振幅值；

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Plot the gain against a time constant, and the shape of the curve tells you the age of the ceramic. Theoretically.

理论上，根据时间变化绘制出所增重量，所绘曲线的形状就可以表明陶瓷的年龄。

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But focusing on close objects involves contraction of muscles controlling the shape of the eye's lens. And one possibility is that "this constant contraction may stretch the eyeball.

目前没有研究显示为什么大量阅读会导致这一结果，但是由于长时间聚焦近处的物体需要眼部肌肉持续收缩以保证视网膜保持需要的形状，因此这种眼肌的持续收缩状态可能会使眼球受到拉伸，长期如此，其原有形状可能会被永久地改变，从而导致近视产生。

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One of the dominant characteristics of beaches is their constant changes in form, shape and sometimes the very material of which they are composed.

UNESCO: Introduction

Constant restoration work keeps it in good shape, and it can be approached through several gates, although the South Gate is the largest and most accessible.

BBC: China��s ancient capital rises again