上空的英文：
up overhead
in the sky

参考例句：

The balcony juts out over the street.
阳台外伸到街道上空。

A reconnaissance plane is circling over the enemy's position.
一架侦察机正在敌人阵地上空盘旋。

He asked them to discontinue flights over the island
他要求他们停止在该岛上空飞行。

Carrier-Based aircraft patrolled above.
以航空母舰为基地的飞机在上空巡逻。

The mushroom cloud of the A-bomb hung over the desert again.
原子弹爆炸的蘑菇云再度笼罩在沙漠的上空。

The surreal blue haze that hangs over the region is a fine mist of volatile oil given off by eucalyptus trees.
在这一地区的上空弥漫着梦幻般的蓝色雾霾，是桉树叶散发的桉树油蒸腾形成的。

The surreal blue haze that hangs over the region is a fine mist of volatile oil given off by eucalyptus trees.
在这一地区的上空弥漫着梦幻般的蓝色霾雾，是桉树叶散发的桉树油蒸腾形成的。

Soundlessly the Sikorski circled the dunes, its fans driving the fine sand down the slopes.
这架西科尔斯基号直升飞机悄无声息地在沙丘上空盘旋，螺旋桨把细沙吹下了斜坡。

Flying into Hong Kong by night is like coming upon a bouquet of neon in a moonless forest. The city blossoms with light.
晚间飞临香港上空，就好像在月黑的森林中看到霓虹的烟火，那可是灯火辉煌，繁花似锦。

SpaceShipOne will fly 100km (62 miles) above the Earth's surface, just breaking through the planet's atmosphere.
“太空飞船一号”将会在距离地球表面100千米(62英里)的上空飞行，这个高度刚刚超出地球的大气层。

overhead是什么意思：
n. 营运开支，普通费用
adj. 在头上的，高架的
adv. 在头顶上，在空中

The hawk is hovering overhead.
鹰在头顶上盘旋。

That was the performance overhead of the profiler.
这就是分析器的性能开销。

Overhead variances may be usefully considered as variable overhead variances and fixed overhead variances.
我们可以把管理费用分为可变费用和固定费用两种。

We heard a jet plane zooming overhead.
我们听见喷射机在头上嗡嗡作响。

Seagulls were flying overhead uttering their mocking cry.
海鸥在头顶盘旋，发出嘲弄的呼叫。

sky是什么意思：
n. 天，天空

The sky is clearing.
天正明朗起来。

Sky is louring.
天空正变得阴沉。

After the storm the sky cleared.
暴风雨过后，天空明朗了。

And then, in the late afternoon the sky will clear,
然后，下午晚些时候天空变晴，

Stars glittered in a clear sky.
星星在晴空中闪烁。