A curve is a line formed by changing the direction of a moving point, and it can also be imagined as a curved wave line. At the same time, the word curve can refer to the lines of human body. In mathematics, it also refers to the general designation of straight lines and non-straight lines, rather than "curves" in the general sense.

1. A line formed by the continuous change of direction when the moving point moves.

2. It refers to the curved wavy line. Especially the lines of the human body. Mao Dun's Exercise 12: "If there is anything to blame, it is that she is wearing a beautiful silk dressing gown, and the curves are all revealed."