ascend from the ground的意思|示意

Planes must zigzag from one ground beacon to the next, and ascend and descend in steps at each stage obtaining permission from the ground.

飞机从一个地面信标到下一个信标曲折飞行，在每一阶段都要经过地面的许可才能上升和下降。

Instead of flying straight, planes must zigzag from one ground beacon to the next, and ascend and descend in steps, at each stage obtaining permission from the ground.

客机必须曲折地从一个信号站飞到下一个，而不是直线飞行；每一步上升或下降都需要得到地面的许可。

The elevator that runs from the ground floor to the fifth floor will be replaced and will ascend and descend in a new, fire-resistant shaft.

原从 地面至五楼的电梯将被更新，同时风井将改为防火的。