I know what a mainsail is.
我知道主帆是什么？
Bend a mainsail onto the boom.
把主帆系在帆杆上
They went aft to hoist the mainsail.
他们向船后走去升主帆。
On a mainsail, the luff attaches to the mast.
在一面主帆上，帆前缘被连接到桅杆上。
Clew the mainsail down, the wind is too strong.
拉下主帆, 风太大了。
Clew the mainsail down ,the wind is too strong .
拉下主帆，风太大了。
The mizzen sail functions much like a second mainsail.
航行中后桅帆基本上就像第二面主帆一样工作。
A small sloop with a mainsail, jib, and keel but no bowsprit
有一个主帆、三角帆和龙骨但没有船首斜桅的单桅小帆船
When they reached an harbour, the sailors clewed the mainsail down.
当他们抵达一个港口时，水手们落下了帆桁。
The jibs I speedily doused and brought tumbling to the deck; but the mainsail was a harder matter.
我迅速放下三角帆扔到甲板上，但却难以对付主帆。
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