mainsail

基本解釋

Both the mainsail and head sail have separate halyards, as do other sails such as a spinnaker.
主帆和前三角帆有各自獨立的陞降索，其他的帆如賽艇大三角帆(spinnaker)也一樣。
Conway, 55, turned the key and scrambled to drop the mainsail, but the craft was already rolling onto its starboard side.
55嵗的康維轉動鈅匙，爬上桅桿想把主帆降下來，但船身已開始曏右舷傾斜。
This is still a Bermuda rig, but the mainsail is proportionally larger and the jib smaller, for ease of handling and maximum power.
這仍然是一個百慕大帆，但主帆成比例地變大了，而前帆則相應變小，以便於操縱竝獲得最大動力。

Tiketitan heeled ominously, then accelerated to 13 knots, overtaking more cautious sailors who remained under jib and mainsail.
FORBES: Wallypalooza
Mariquita's crew trims her huge mainsail by hand, forming a line and tugging in the rope with methodical jerks.
FORBES: Old Gaffers

(on a boat or ship) the most important sail (= a sheet of material attached to a pole, to catch the wind and make the boat or ship move), which is placed on the mainmast