boom mainsail

基本解释

In general, to furl a sail is to roll it up, such as to furl the mainsail on the boom (or into the boom or mast in some contemporary systems).
一般来说，furl 一张帆就是将其卷起，比如“卷起在悬臂(boom)或者在某些现代系统中的桅杆(mas)上的主帆”。
The mainsail is a tall, triangular sail mounted to the mast at its leading edge, with the foot of the sail along the boom, which extends aft from the mast.
主帆（mainsail）是一面高的，三角形的帆，其前缘安装在桅杆上，而帆尾安装在从桅杆向后延伸出的悬臂上。
The mainsail of a cat rig may have a traditional boom or, as in this boat, a loose-footed mainsail attached at the aft corner to what is called a wishbone boom.
一艘单桅艇的主帆可能有一个传统的悬臂，也可能（像在这艘船上那样），帆尾松弛地系在船尾一角的所谓的“横臂悬臂”（wishbone boom）。