Obviously, some extra check would be performed after the user hit the Submit button.

显然，用户点击提交按钮后，会进行一些额外的检查。

youdao

For example, you may have to pay for any food or drinks you have on the plane, and you may have to pay extra if you check baggage instead of carrying it on the plane.

例如，你可能需要为飞机上的任何食物或饮料付钱；如果你选择托运行李而不是带其上飞机，你可能需要额外付钱。

youdao

If you return a null array, the clients of the code must write extra code to check whether the return value is null (as shown in Listing 13).

如果您返回零数组，该代码的客户端必须编写额外的代码来检查返回值是否为零(如清单13所示)。

youdao

I know that they are going to extra check my harness.

VOA: standard.2010.07.26

So, if you pay your entry fee and then write an extra check, deduction on the extra.

FORBES: Run With It: Sports, Races and Taxes

Ministers are examining if the extra check could "reduce the risk to domestic violence victims", she said.

BBC: UK Politics

"As reluctant as many pharmacists and consumers are to take the extra time, it is worth one last extra check to make sure nothing will go wrong, " says Michael Negrete, chief executive of the Pharmacy Foundation of California.

WSJ: When 'Use Only as Directed' Isn't Easy