931 × 818 (4キロバイト)Stannered{{Information |Description=The boundary between a system and its surroundings |Source=en:Image:System-boundary.jpg |Date=2008-01-09 |Author=en:User:Wavesmikey, traced by User:Stannered |Permission={{PD-user-en|Wavesmikey}} |other_versions=[[ ファイルの使用状況