单词：field line
field line的用法和样例：
例句
- A strong magnetic field can constrain electrons to move only along the field lines.强磁场可约束电子使之只能沿着场力线运动。
- At each crossing of an equipotential and a field line, the two are perpendicular.在等位面与电力线的每个交点，两者是垂直的。
- Measuring aerial power line vibration is a key link of anti-vibration design of conductors.架空电力线振动测量是导线防振设计的重要环节。
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