约等于的英文-九游官网

1、折射率大约等于实际深度与视深度的比值。

the refractive index is approximately equal to the ratio of the real depth over the apparent depth.

2、这面积，约等于平行四边形的一半，我能用向量表示它。

so, the area is approximately equal to one half of the area of a parallelogram that i could form from these vectors.