check against the original的意思|示意

If the user hasn't submitted a username or password, the script simply returns the original instance to the login page, but if the information is there, check it against the database.

如果用户并未提交用户名或密码，则脚本会把最初的实例返回给登录页面，但是如果有了这些信息，则通过数据库检查它们。

Please check the copy against the original.

请对照原件把抄件核对一下。

Once you have finished creating an item, like the lips, it's important to check them against the original.

一旦你完成一个项目，如嘴唇，最重要的是和原始图层进行核对。