boom mainsail

基本解釋

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).
一般來說，furl 一張帆就是將其卷起，比如“卷起在懸臂(boom)或者在某些現(xiàn)代系統(tǒng)中的桅桿(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，其前緣安裝在桅桿上，而帆尾安裝在從桅桿向后延伸出的懸臂上。
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.
一艘單桅艇的主帆可能有一個(gè)傳統(tǒng)的懸臂，也可能（像在這艘船上那樣），帆尾松弛地系在船尾一角的所謂的“橫臂懸臂”（wishbone boom）。