sentence1: the belle detector is a large-solid-angle spectrometer consisting of a three-layer silicon vertex detector , a 50-layer central drift chamber located inside a superconducting solenoid coil that provides a 1 5 t magnetic field .
sentence2: the belle detector is a large-solid-angle magnetic spectrometer that consists of a three-layer silicon vertex detector crystals located inside a super-conducting solenoid coil that provides a 1 5 t magnetic field .