Area of 13.4 mx 6.1 m free from all obstacles up to the height of 8m measured from the floor surface (sand and grass court not advisable).是什么意思_Area of 13.4 mx 6.1 m free from all obstacles up to the height of 8m measured from the floor surface (sand and grass court not advisable).在线翻译_英语_读音_用法_例句