No, unless it's a lower case letter.

否， 除非是小写字母。

The opposite - the small letters would be lower case letters.

相反 - 小写字母将是小写字母。

[Paige] That one time is when you are pluralizing a lower case letter.

- [Paige] 那一次是你将一个小写字母复数化。

The ideal password should be at least eight characters long, and contain upper and lower case letters, symbols and numbers.

理想的密码长度至少应为八个字符，并包含大小写字母、符号和数字。

Think of like an imaginary reaction A plus B yields C plus D. The lower case letters represent the coefficients of the reactants and products.

想象一个假想的反应 A 加 B 产生 C 加 D。小写字母代表反应物和产物的系数。

And five bits can store 32 possible values – so that’s enough for the 26 letters, but not enough for punctuation, digits, and upper and lower case letters.

五位可以存储 32 个可能的值——所以这足以存储 26 个字母，但不足以存储标点符号、数字和大小写字母。

Instead of using upper and lower case letters, you use all capital letters – all upper case letters – all caps, it's considered a little angry or impolite on an Internet forum.

不要使用大小写字母，而是使用全部大写字母——全部大写字母——全部大写，这在互联网论坛上被认为有点生气或不礼貌。