测绘专业与英语lessonone .pptVIP

测绘专业英语English for Surveying 测绘遥感信息工程系 常德娥 2009.09.01 Lesson One  Summary of Definitions Lesson One: Summary of Definitions New words and Expressions level surface 水准面 curved adj. 弯曲的 element n.. 元素 normal to 与……垂直，是……的法线 plumb line 铅垂线 disregard vt. 不考虑、不管 New words and Expressions deviation n. 偏离、偏差 vertical n. 垂直线 adj.垂直的 mean adj. 平均的 spheroid n. 旋转椭球体 horizontal plane 水准面 tangent to 与……相切 intersection n. 交叉、相交 New words and Expressions perpendicular to 与…..垂直 nadir n. 天底 zenith n. 天顶 term vt. 称……为…….. inclined adj. 倾斜的 in practically 实质上，实际上 equivalent adj. 等价的 New words and Expressions elevation n.. 高度、海拔 Arbitrarily adv. 任意的 Assume vt. 假定为 Datum n. 大地水准面 Contour n. 轮廓、等高线 Corresponding adj. 相应的 New words and Expressions Difference in elevation 高差 Leveling n. 水准测量 Gradient n. 倾斜度 Slope n. 坡度 Text Part 1: Definition of level surface (para 1) A level surface is a curved surface, every element of which is normal to a plumb line, disregarding local deviations of the plumb line from the vertical with the mean spheroid surface of the earth. 水准面是弯曲的表面，水准面上的每一个元素都与铅垂线垂直，（这种垂直关系）是假定不考虑某处的铅垂线与地球平均旋转椭球面的垂线间的偏差。 The picture of level surface Part 2 : Definitions of horizontal plane、horizontal line and angle (Para2、3 and 4) A horizontal plane is a plane tangent to a level surface at a particular point. 水平面是在特定点上相切于水准面的平面. Horizontal line and angle A horizontal line is a line tangent to a level surface. 水平线是相切于水准面的线. In surveying,