enlarge: v.放大
jam: v.卡纸
lighten: v.变淡
make a copy of: 影印一份……
original: n.原稿
percentage: n.百分比
reset: n.重新设定
scroll down: 向下卷动
size: n.大小；尺寸
smudge: n.脏污
streak: n.刮痕
toner: n.碳粉
two-sided: a.双面的
warm-up time: 热机时间