That means there's plenty of time before we have to go to the security checkpoint and put our baggage through the X-ray machine. I want to do some duty-free shopping before we go to our boarding gate.

这就说明在我们进行安检和把包放进X光检查器之前我们还有很多的时间。 我想在我们去登机口之前买些免税的东西。

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As you're swiping your boarding pass ( or smartphone), the machine also scans it for particle-sized traces of explosive materials and sends the all-clear or no-go in less than two seconds.

ENGADGET: Hitachi boarding gate can sniff explosives on passes, keep the transport queues flowing (video)