B737 FLT CREW DEPARTING PHL IS CLEARED TO TAXI VIA H AND E HOLD SHORT RWY 27R. FLT CREW DOES NOT HEAR E AND CTLR DOES NOT CORRECT READ BACK. RWY INCURSION OCCURS AT RWY 35 AND TXWY H.

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AFTER ENG START; RAMP TWR TOLD US TO TAXI TO SPOT 11 AND CONTACT GND. AS WE APCHED SPOT 11 WE CONTACTED THE GND CTLR. THE INSTRUCTION AS WE HEARD WAS; 'TAXI 27L VIA HOTEL. HOLD SHORT 27R.' AS WE APCHED RWY 17/35 TO CROSS; WE CLRED L AND R; AND I BEGAN TO SLOW THE ACFT. JUST AS WE APCHED THE HOLD SHORT OF RWY 17/35 WE SAW AN ACFT THAT APPEARED TO BE ON LOW APCH RWY 35 FROM OUR R SIDE. WE STOPPED THE ACFT AGGRESSIVELY JUST AS THE GND CTLR WAS TELLING US TO HOLD OUR POS. OUR ACFT NEVER ENTERED THE RWY; BUT I BELIEVE IT DID CROSS THE HOLD SHORT BARS. GND ASKED US WHAT HAPPENED AND WHY DIDN'T WE TURN ONTO TXWY E. WE TOLD HIM THAT WE THOUGHT HE HAD TOLD US TO TAXI VIA TXWY H. WE WERE THEN TOLD TO BACK TAXI RWY 17 AND TURN ON TXWY S. THE TWR CTLR GAVE US A NUMBER TO CALL WHEN WE LANDED. IN OUR CONVERSATION WITH THE TWR SUPVR; HE TOLD US THAT HE HAD LISTENED TO THE TAPES AND THAT THE GND CTLR WAS SPEAKING VERY FAST AND THAT OUR READBACK OF OUR TAXI CLRNC WAS NOT CORRECT AND THE GND CTLR SHOULD HAVE CORRECTED US. WE UNDERSTAND THE IMPORTANCE OF PLTS READING BACK THE CLRNC EXACTLY AS IT WAS GIVEN TO AVOID THIS SITUATION. THE GND CTLR SPOKE VERY QUICKLY; BUT WE SHOULD HAVE MADE ABSOLUTELY SURE WHAT OUR CLRNC WAS BEFORE WE BEGAN TO TAXI. ALSO; WE DID NOT READ BACK THE CLRNC AS WE HEARD IT. WE ONLY READ BACK 'HOLD SHORT RWY 27R.' IF WE HAD INCLUDED; 'TAXI VIA HOTEL; HOLD SHORT 27R;' I'M CERTAIN WE WOULD HAVE BEEN CORRECTED BY GND. WE HAVE TO MAKE PROPER READBACKS EVERY TIME.