因为三角测量和三边测量术观察没有包括第三方面的信息，所以介绍余下的站台的椭圆体高度作为观测参量。

Since the triangulation and trilateration observations do not contain much information in the third dimension, the ellipsoidal heights of the remaining stations are introduced as observed parameters.

youdao

因为三角测量和三边测量术观察没有包括第三方面的信息，所以介绍余下的站台的椭圆体高度作为观测参量。

Since the triangulation and trilateration observations do not contain much information in the third dimension, the ellipsoidal heights of the remaining stations are introduced as observed parameters.

youdao