line of force
柯林斯词典
1. N an imaginary line representing a field of force, such as an electric or magnetic field, such that the tangent at any point is the direction of the field vector at that point 力場的(虛搆)線
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1. N an imaginary line representing a field of force, such as an electric or magnetic field, such that the tangent at any point is the direction of the field vector at that point 力場的(虛搆)線