1. field artillery fire direction system 
   地炮射击指挥系统
2. An instrument for measuring the intensity and direction of a magnetic field. 
   磁强计测量磁场的强度和方向的工具
3. an imaginary line in a field of force; direction of the line at any point is the direction of the force at that point. 
   力场上理论想象线；任一点的切线指向那一点的力场方向。
4. When describing the magnetic field of the Earth we must specify both the direction and the intensity of the field. 
   当描述地球磁场的时候，我们必须强调磁场的方向和强度。
5. a method of controlling the flight of a missile by devices that respond to the strength and direction of the earth's gravitational field. 
   一种由地球万有引力引导飞行物飞行的操控方法。

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• 1. 方向场
  direction cosine 方向余弦...direction field 方向场...direction of principal axis 轴方向
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