It has a huge mast, with the mainsail attached.

它有一个巨大的桅杆，主帆附着上面。

This one here is called the main sail.

这个在这里被称为主帆。

How do you get the mainsail up? Uh...

要怎么把主帆升上去。

So they literally windsurf off the wind that comes off the mainsail and they hang.

所以他们真的是利用主帆吹的风帆冲浪，然后悬挂起。

You can control this main sail, whether it's close or far out, and to have that just in the right place will affect the speed of the boat.

你可以控制这个主帆， 无论它是靠近还是远离，把它放在正确的位置会影响船的速度。

I was very much tired, and disposed to sleep, which my mistress perceiving, she put me on her own bed, and covered me with a clean white handkerchief, but larger and coarser than the mainsail of a man-of-war.

我倦，准备睡觉，女主人看出了这一点，她把我放在她自己的床上，并用一块干净的白手帕盖在我身上，但比军舰的主帆更大更粗糙。