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

这面积，约等于平行四边形的一半，我能用向量表示它。

youdao

r So, let's remember that the amount by which we moved, t delta r, is approximately equal to v times delta t, OK, and just using the definition of a velocity vector.

所以记住移动的量△,约等于v*△,这是用速度矢量的定义。

youdao

As shown, the earth's mean radius is about 6378 km, while the altitude and orbit radius of a GSO satellite is approximately equal to 35786 km and 42164 km respectively.

由静止卫星的轨道位置示意图可见，地球的平均半径约为6378公里，静止卫星的轨道高度约为35786公里，轨道半径约为42,164公里。

youdao

Although they cannot draw more than the maximum amount - which is approximately equal to a good health annuity - there is more flexibility over the death benefits.

BBC: Enhanced annuities: Who can benefit?