Your friend has been waiting for you at the International Arrivals area in the airport. He has just spotted you coming through the arrival gate.

你的朋友已在机场的国际航机候机处等候你。他刚见到你从闸口走出来。

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Another option from WeCU is a "smart seat, " or cushion full of hidden biometric sensors that could provide a more detailed read on someone sitting in an airport waiting area, Givon says.

CNN: Behavioral screening -- the future of airport security?