"Seeing a full moon in the sky" can be translated into Engpsh as "observing a full moon in the air." The phrase "full moon in the sky" refers to the appearance of the moon when it is fully illuminated and visible in the night sky. This phrase is commonly used to describe the natural phenomenon of a full moon, which occurs when the moon is completely illuminated by the sun as seen from Earth.

The phrase "full moon in the sky" can be used in a variety of contexts, such as describing the appearance of the moon on a clear night or expressing a sense of wonder or awe at the beauty of the full moon. Here are a few example sentences in Engpsh and their translations in Chinese:

"I love looking at the full moon in the sky on a clear night. It's so beautiful and peaceful." (我喜欢在晴朗的夜晚看空中的满月。它真的很美丽和宁静。)
"The full moon in the sky is a sight to behold. It's amazing how it seems to glow from within." (空中的满月真是一道好看的景象。它好像从内部发光，真的很神奇。)
"Whenever I see the full moon in the sky, I can't help but feel a sense of magic and mystery." (每当我看到空中的满月，我就情不自禁地感到一种魔力和神秘感。)