external obstacles external offices external oil external one external opening external openness external operations external operators external order external organisations external organizations external organs external origin external otitis external output external package external packaging external panel external parameters external parasites external parking external participants to external parties external parties external partnerships external partners external partner external parts external party external part external peace external people external perception external performance external perimeter external peripherals external personnel external perspective external phenomena external phone external piping external platforms external player external plugins external pockets external pocket external policies external policy external political external portal external port external position external power adapter external power required external power source external power supply external power external pressures external pressure external printer external priorities external probe external problems external procedures external processes external processing external processor external production external products external profile external programmes external programming external programs external program external projection external projects external promotion external protection external providers external provider external public external publishers external pump external quality assurance external quality external radiation external radiotherapy external ratings external reality external reasons external rebalancing external receiver external recipients external recognition external recorder external recording external recruitment external references external regulations external relations has external relationships external relations to external relations external reporting external report external representation external representatives external requests external requirements external researchers external research external reserves external resistance external resources external restrictions external reviewers external review external rewards external ring external risks external role external rotation external rotor external rules external safety external sales external screen external scripts external scrutiny external seams external search external sector external security policy external security external sensors external sensor external sequencer external server external service providers external services external service external shape external sharing external shell external shielding to external shocks external shocks external shock external shower external side external signal external signs external similarity external sites external site external situation external size external skeleton external skin external social external software external solidarity external solutions external solution external sound to external sources external source external space external speakers external speaker external specialists external spending external stability external staff external staircase external stairs external stakeholders external standards external state external static pressure external stereo external stimulation to external stimuli external stimuli external stimulus external storage devices external storage device external storage external strategy external stressors external stress external structure external students external studies external study external style external substances external subtitles external subwoofer external success