桅杆顶端 meaning in English

mast head

Stand up on the board , using the uphaul ( the thick rope or webbing which attaches from the front of the boom to the bottom of the mast ) for stability , and put your feet where your knees had been , on either side of the mast and over the centerline
站在滑板上，利用升降索（从桅杆顶端到底端的那根粗绳子或带子）保持平衡，双脚放在刚才膝盖的位置，也就是说桅杆的两边，并越过中心线。