1. The password must be alphanumerical, meaning it must contain both letters and numbers.
密码必须是字母数字组合，即必须包含字母和数字。

2. The serial number on the product is alphanumerical, with a combination of letters and numbers.
产品上的序列号是字母数字组合，包含字母和数字的组合。

3. Please enter your alphanumerical code to access the secure website.
请输入您的字母数字代码以访问安全网站。

4. The file name should be alphanumerical, without any special characters or symbols.
文件名应为字母数字组合，不得含有任何特殊字符或符号。

5. The barcodes on the inventory are alphanumerical, allowing for easy tracking of products.
库存上的条形码是字母数字组合的，方便追踪产品。

6. When creating a new username, make sure it is alphanumerical and not easily guessable.
创建新用户名时，请确保它是字母数字组合的，而不容易被猜到。