Hình Cơ Bản -- Primitives

Tham Chiếu -- Reference

Chế Độ -- Mode

Chế Độ Vật Thể và Chế Độ Biên Soạn -- Object Mode and Edit Mode

Trình Đơn -- Menu

Cộng Thêm (Add) ‣ Đường Cong (Curve)

Phím Tắt -- Hotkey

Shift-A

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When adding curves there are some common options like other Objects.

In Object/Edit Mode, the Add Curve menu, provides five different curve primitives:

Đường Cong Bézier -- Bézier Curve

Adds an open 2D Bézier curve with two control points.

-- Bézier Circle

Adds a closed, circle-shaped 2D Bézier curve (made of four control points).

NURBS Curve

Adds an open 2D NURBS curve, with four control points, with Uniform knots.

NURBS Circle

Adds a closed, circle-shaped 2D NURBS curve (made of eight control points).

Đường/Đi/Dẫn -- Path

Adds a NURBS open 3D curve made of five aligned control points, with Endpoint knots and the Curve Path setting enabled.