注意，我们添加了两个参数，以便用户可以更改标尺的名称并指定其长度。

Notice that we added a couple of parameters to allow a user to change the name of the ruler and to specify the length.

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您还可以任意添加多个参数，例如，尝试添加颜色或标尺高度参数。

You can also parameterize as many aspects as you wish. Try adding color or ruler height as parameters, for example.

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迄今为止，地球轨道参数的变化是地质尺度上惟一可以精确定量计算的周期现象，可以用作地质计时的标尺。

Up to now, the Earth's orbital parameters remain the only periodicities in geology subject to precise calculations and, therefore, may provide new scales for geochronology.

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