The view is to the north of the station's ground track.

拍摄视角是空间站地面轨迹正北方。

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Click on the object you wish to display a ground track of to select it.

点击选择你要显示其地面轨迹的卫星名称。

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The label check box allows you to switch the time labeling of the ground track on or off.

标签框用于确定你是否要标注地面轨迹。

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Remember, you've got to keep track of the sign of acceleration, so if you're picking up speed towards the ground, a is negative, so it will be g plus a, but a is a negative number.

记住,一定要注意加速度的符号,所以当你加速下降的时候,a 是负的,还是 g 加上 a,但是 a 是负数

耶鲁公开课 - 基础物理课程节选

The crash happened just before 5 p.m. on an above-ground track on the Red Line in the District of Columbia near the border with Takoma Park, Maryland.

CNN: Six killed in Washington-area Metro train collision

This follows Tottenham's announcement last week that it wanted to demolish most of the Olympic stadium and build a new ground without a running track.

BBC: Olympic stadium

But I can report that thanks to the extraordinary service of our troops and civilians on the ground, we are on track to achieve our goals.

WHITEHOUSE: President Obama on Afghanistan-Pakistan Review