小帆艇通常使用一种常见的主帆类型，称为三角帆。三角帆是一种三角形的帆，由一个立杆固定在船上，帆面由三块帆布片拼接而成。这三块帆布片分别称为前帆（位于立杆的前侧）、主帆（位于立杆的中央）和后帆（位于立杆的后侧）。主帆是最大的一块帆布片，也是承担船体推进力的帆。“主帆”也可以泛指小帆艇上的任何主要帆。

英文介绍

Small sailboats typically use a common type of main sail called a triangular sail. A triangular sail is a type of sail that is fixed to a ship by a pole, and the sail surface is made up of three pieces of canvas spliced together. These three canvas pieces are called the front sail (located on the front side of the pole), the main sail (located in the center of the pole), and the rear sail (located on the back side of the pole). The main sail is the largest canvas piece and also the sail that bears the propulsion force of the ship. "Main sail" can also refer to any main sail on a small sailboat.