Base class sub-objects may have zero size.

基类子对象可以具有零大小。

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The base case is whenever S1 or S2 is a zero-length string.

（基线条件（basecase）是S1或S2为长度为零的字符串的情形。

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Estimates with zero degrees of freedom represent the base (reference) level of an attribute.

估计用自由的零程度表现属性的基础(叁考)水平。

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Estimates with zero degrees of freedom represent the base (reference) level of an attribute.

估计用自由的零程度表现属性的基础(叁考)水平。

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