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.
注意站台与列车之间的高度差及空隙。
Please mind the gap and height difference between the train and platform.
这种公交车是普通公交车的两到三倍长，配有成排的车门，它们距地面的高度与站台平齐，这一排门一打开，所有人都像坐地铁那样蜂拥上下车。
The buses themselves are double or triple long, with a wall of doors, and they pull up to platforms level with the bus. The wall of doors opens, everyone piles off and on, just like a subway.
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