You might wonder which is sky, which is ground?

你也许会纳闷哪是天哪是地？

youdao

Lie on a remote beach under the night sky, look at the curvature of the earth and gaze with wonder at the stars. Spend time appreciating and understanding just how small you really are.

躺在夜幕下辽阔的沙滩上，看着蜿蜒的地平线，细数着天上无数的繁星，花些时间去发现并且庆幸——自己是多么的渺小。

youdao

I I wonder if our children will still be able to breathe the clean air, drink clean water and see the blue sky.

不知道我们的孩子们是否还能呼吸清洁的空气，喝到干净的水，看到蓝色的天空。

youdao

At first you wonder why, and then it is explained that the telescope must swivel as it tracks objects on the sky, and that means the instrument has also to rotate if it wants to keep a lock on those same galaxies.

BBC: Super-chilled robot ready to slice and dice