The current National Christmas Tree was planted on the Ellipse in 1978.
现在的这棵国家圣诞树是1978年在椭圆广场栽种的。
Next, rotate and store this matrix; then, offset from the current coordinate system with translate (which is applied from the previously rotated and translated matrices), and draw a red ellipse.
接下来，旋转和恢复这个矩阵；然后，使用translate设置与当前坐标系统的偏移量(这是从之前旋转和转换的矩阵应用的)，并绘制一个红色椭圆。
According to the superposition principle and the second kind of complete ellipse integral, the magnetic field current circle was calculated.
运用磁场的叠加原理及第二类完全椭圆积分，给出了椭圆形稳定电流环垂直轴上的磁感应强度。
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