The channel is marked by buoys.航道有浮标表示.Often they mark the path with buoys.他们常常用浮标作为航道的标志.Boys in the boat bought buoys in the moat.船里的男孩买了护城河里的浮筒....

buoys的音标：...

n.浮标( buoy的名词复数 )，航标，救生圈，救生衣v.使浮起( buoy的第三人称单数 )，支持，为…设浮标，振奋…的精神...