求翻译下面句子注意,这里电荷q所在的位置的坐标轴是与运动电荷运动方向是垂直的.注意到,因为时间轴有个虚数单位i,空间平面需要旋转90˚,所以（图1、图2所示的）x轴是运动电荷运动的

Question

求翻译下面句子
注意,这里电荷q所在的位置的坐标轴是与运动电荷运动方向是垂直的.
注意到,因为时间轴有个虚数单位i,空间平面需要旋转90˚,所以（图1、图2所示的）x轴是运动电荷运动的方向,而对于电荷q,则是垂直于运动电荷运动的方向.如果此时两个电荷之间的连线与运动方向不垂直,则要考虑画三维图,其中空间平面的投影如图3所示.

Answer 1

Note that the coordinate axis of charge q is perpendicular to the direction of the moving charge.
Note that there is a imaginary unit i on the timebase and the space plane needs to rotate 90 degree, so (shown in figure 1 and 2) X axis is the direction of the moving charge, while it's perpendicular to the direction of the moving charge for charge q. If the line connecting the two charges is not perpendicular to the motion direction, three-dimensional diagram should be considered. The projection of space plane is shown in figure 3.