They extract what they can, which is mostly the metals -- circuit boards and so forth -- and they leave behind mostly what they can't recover, which is, again, mostly the plastics.
Mereka mengambil apa yang mereka bisa, kebanyakan logam -- papan sirkuit dan sebagainya -- dan mereka membiarkan apa yang tidak bisa mereka ambil kembali, yang, kembali, kebanyakan plastik.