To switch between modes, an additional check is required in each pass of the main program loop.

要在模式间进行切换，需要对主程序循环的每次循环执行额外的检查。

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Before calling the method, you first check that there is at least one SQL warning; if so, you pass the first SQLWarning object to the appropriate method.

在调用这个方法之前，首先要检查是否至少有一个SQL警告；如果有，就将第一个SQLWarning对象传递给适当的方法。

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Passengers who pass a background check are eligible to use expedited screening lanes.

通过了背景调查的乘客有资格使用加急安检通道。

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Congress, again including members of his own party, wouldn't pass his "card-check" legislation eliminating secret ballots in union elections.

WSJ: Strassel: Obama's Imperial Presidency

My airline allowed me to print out a boarding pass and bypass check-in because I had no bags to check.

FORBES: J.C. Penney Faces Reality. Are You?

Government regulations mean that, beginning next March, security guards will have to undergo four days' training and pass a criminal-record and background check.

ECONOMIST: Public and private security