1. The angle or inclination of a line or surface that meets another at any angle but90=. 
   斜角，斜面一直线或平面与另一（直线或平面）相交所成的除90°外的任意角或倾角
2. The angle of inclination from the vertical of a vein, fault, or lode. 
   倾斜余角因矿脉，断层或矿井倾斜而与垂直面形成的角度
3. an instrument used by surveyors in order to measure an angle of inclination or elevation. 
   用来测量倾斜角的测量员使用的装置。
4. (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees. 
   （天文学）轨道平面和具有固定度数的黄道平面之间的夹角。
5. a surveying instrument consisting of a spirit level and a sighting tube; used to measure the angle of inclination of a line from the observer to the target. 
   由一个水平仪和一个观测管组成的测量工具；用来测量从观测者到目标的直线的倾斜角。

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