Small letters are sometimes called lower case and large letters upper case . Mixing : Having more than one typeface style or size in one line of text .

字体混合：在一字行内，有多过一种字体、字款和字 大小 的 情况。

The case first attribute controls whether upper case characters collate before or after lower case characters in the absence of other differences in the two text strings .

大小写优先属性控制在两个 文本字符串中没有其他差异的情况下， 大写字符排列在小写字符前面还是后面。