a flat blade that is moved by wind or water and is part of the machines in a windmill, etc. （风车等的）叶片，翼，轮叶 The windmill’s sails are wooden vanes whose angle can be adjusted from inside the mill. 风车的帆是木制叶片，可以从轧机内部调整角度。
Word Originlate Middle English: dialect variant of obsolete fane ‘banner’, of Germanic origin.