Validity code

• 验证码

Validity code的用法和样例：

例句

1. Enter your password and membership verification code.
   输入您的会员密码及验证码。
2. Due to that the authentication code of the watermark structure is self-contained, tampering the structure will lead to the application's undefined behavior.
   由于水印结构的验证码是自包含的，对其篡改会导致应用程序功能错误。