一般来说，从地面以上365米的高度，整个国家都被管制空域覆盖。

In general, from 365m above the ground and higher, the entire country is blanketed by controlled airspace.

youdao

在8000米的高度，只有30%的氧气，人体只能处于这个高度仅几天，所以人类再往上爬是危险的。

At the height of 8,000 meters, there is only 30% O₂ and the human body can only stand this height for a few days, so it is dangerous for humans to climb higher.

youdao

它将在300千米的高度绕地球运行。

It will travel around the Earth at a height of 300 km.

youdao

So y=y0+5 meters, and that was the height to which it rises.

因此y=米,这就是它会上升的高度

耶鲁公开课 - 基础物理课程节选

By the way, I didn't tell you this but I think you know that I picked my origin to be here and measured y positively to be upwards and I called that 15 meters.

顺便说一下,虽然我没明确指出,但我想你们应该都知道,我把原点取在这里,并规定y的正方向朝上,我设把这里的高度为15米

耶鲁公开课 - 基础物理课程节选