In this paper conditions for such a kind of orbits, the minimum altitude variation orbits, are derived and related parameters are given.

本文推导了这种最小高度变化轨道的条件，并给出了相应的参数。

youdao

That is the barest minimum, but $50,000 provides a much safer flying altitude.

这是最低的要求了，50000元会保证更安全的飞行高度。

youdao

Check your minimum and critical altitude.

检查你的最低标准和警告高度。

youdao

The altitude at which the co-pilot handed control of the plane to his colleague was below the minimum altitude considered safe to continue final descent.

CNN: Pilot training blamed for Bali airliner crash