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。

youdao

Either way, if its roots are pulled up from out of the ground as the tree topples over, then there's usually a big hole, a pit left in the ground where the roots used to be.

无论是哪种原因，如果树倒在地上时树根从地下被拔起，那么地面通常会有个大洞，在原来树根所在地留下一个坑。

youdao

Another way of countering drought is to have a limited amount of mass above ground and to have extensive root networks below ground.

对付干旱的另一种方法是在地面上种植特定数量的植物，并且确保地下有广大的根系网络。

youdao

The short wave signals bounce off the ionosphere that surrounds the Earth,back to the ground and then back to the ionosphere.

VOA: special.2010.12.08

Then he flung outward, feet first, with a swish, Kicking his way down through the air to the ground.

然后，纵身一跳，他两脚先伸出去，在空中乱踢乱舞，于是飕的一声，降落到地面。

耶鲁公开课 - 现代诗歌课程节选

so I don't know, I think it's just really cool to be able to work something from the ground up.

所以，我不知道，我就是觉得能从头开始做一件事很酷。

什么是认知科学？ - SpeakingMax英语口语达人

The turret does not rotate a full 360 degrees, so in ground-to-ground combat trying to manoeuvre the long-bodied Walrus around to get a firing position can prove frustrating.

FORBES: Review - Carrier Command: Gaea Mission

Boeing figures it delivers 20 megabits a second from the ground to the aircraft, and one megabit a second back to the ground.

FORBES: Coffee, Tea Or Broadband

"We have seven observers on the ground today, two more are arriving on Monday to bring those on the ground to nine ... (and) we will make the numbers up to 30 some time during the course of next week, " said Ahmad Fawzi, spokesman for Annan.

CNN: U.N. Security Council to vote on Syria observer mission