| 释义 |
DEFINITIVE EXAMPLES 权威例句〔boom〕A long pole extending upward at an angle from the mast of a derrick to support or guide objects lifted or suspended.吊杆：从起重机的竖樯上以一定角度向上伸出的长杆，用来支持或牵引物体竖立或吊起美国传统〔butterfly stroke〕A swimming stroke in which both arms are drawn upward out of the water and forward with a simultaneous up-and-down kick of the feet.蝶泳：一种游泳姿式，双臂向上伸出水面再向前，脚同时上下拍打击水美国传统 |