Mainsail
n. 大桅的帆, 主帆
📖 牛津释义
mainsail
n
principalsail on a sailing-ship, usu attached to the mainmast （主桅上的）主帆. =>illus at yacht 见yacht插图.
🗣️ 情景例句
You do. You do. There's a book here.
当然 ，当然。书要出版。
I can't believe it!
简直无法相信！
Number 13 buses run much more frequently, don't they?
13路车跑得更勤，是不是？