a tall upright post, spar, or other structure on a ship or boat, typically one of several and in sailing vessels generally carrying a sail or sails 桅杆 ■a similar structure on land, especially a flagpole or a television or radio transmitter 杆状物;旗杆,天线杆
常用词组 before the mast
(historical)serving as an ordinary seaman in a sailing ship (quartered in the forecastle) (史)作为普通水手
nail (或 pin) one's colours to the mast
declare openly and firmly what one believes or favours 公布信仰;表示坚决支持 they nailed their colours to the mast of youth revolt. 他们公开表示坚决支持青年人的反叛。