咩叫MATTER?

matter>particle>substance
Basics of our system and the X-windows environment
Applications Overview of common and useful programs
Printing Information on printing
Remote access How to connect to, and transfer files to theory from home
Remote mail How to read your email on theory from anywhere in the world
Remote application access How to run graphical programs on theory from your home windows/linux computer
Power outtages In case your computer asks for the root password after a power outtage

所有宇宙中存在的都是物質，所有物質都由粒子組成，粒子是一個統稱，如電子、分子、中子等都是粒子，substance就是具特有物理特性的物質。
matter=物質
particle=粒子
substance=物質