这张图片展示了宇宙的浩瀚。

The image shows the ___vastness of space.

戈壁沙漠的辽阔让人感到自身的渺小。

The ___vastness of the Gobi Desert makes one feel insignificant.

站在山顶，他感受到了大自然的辽阔。

Standing on the mountaintop, he felt the ___vastness of nature.