Just look at these letters, symbols, formulas, and mumbled jargon.

看看这些字母、符号、公式和疯话蠢语。

But there are non- letter symbols. There's these medieval ones.

但这些都不是字母 看起来是中世纪符号。

This was the first alphabet to call each symbol a letter and represented a specific sound.

这是第一个将每个符号称为一个字母，并代表一个特定发音的字母表。

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。

If you really want to be safe, you need to have a different password for each one, and each password needs to be incredibly complicated, with a mix of capital letters, symbols, and numbers.

如果你真的想要安全，你需要为每个密码设置不同的密码，而且每个密码都需要非常复杂，混合使用大写字母、符号和数字。