求翻译：由于这些交通工具的车厢为金属外表，大量的手机电磁波在车内来回反射，电磁波密度大大超过国际安全标准。他还发现即使手机处于待机状态，情况也完全一样。是什么意思？

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Because these transport carriage for metal appearance, a large number of mobile phone electromagnetic wave reflected back and forth in the car, the electromagnetic wave density significantly exceed international safety standards. He also found that even if the phone is in standby state, the situatio