question: hardware:software
choices.label: A B C D
choices.text: the first quarter moon:the last quarter moon fade in:fade out win:loss real concept:empty concept
explanation: a computer system consists of "hardware" and "software". in addition to the "the first quarter moon" and "the last quarter moon", there are other moon phases such as the new moon. in addition to "fade in" and "fade out", there are other ways for the image to appear or disappear, such as fly-in and fly-out. in addition to "win" and "loss", there are other circumstances such as dismissal of the suit. concepts consist of "real concepts" and "empty concepts".
relation: hardware software R2.5
relation: the first quarter moon the last quarter moon R2.6
relation: fade in fade out R2.6
relation: win loss R2.6
relation: real concept empty concept R2.5