1.Crows cawed from the poplar trees overhead.

1.白杨树上的乌鸦在上呱呱乱叫。

2.A great congregation of birds flew overhead.

2.一大群鸟从头上过。

3.Vultures circled overhead as the lions fed.

3.狮子进食的时候，禿鹫在上盘旋。

4.Many stars overhead are invisible to the naked eye.

4.天上的许多星星是肉眼看不到的。

5.Heavy overheads reduced his profits.

5.经费开支大因而减少了他的利润。

6.The people in the room overhead were very noisy yesterday evening.

6.昨晚在楼上那个房间的人很吵。

7.The thick clouds passed overhead, but fortunately the rain kept off the whole day.

7.虽然乌云密布, 但很一整天都没下雨。

8.Half the number of bolts in floating head of deethanizer overhead cooler were brittle fractured.

8.气体分馏装置脱乙烷塔顶冷却器浮头螺栓，半数发生脆性断裂。

9.The sky was bright and cloudless overhead, and the tops of the trees shone rosily in the sun.

9.头上的大晴朗无云，林在晨光下泛着一抹玫瑰红。

10.The trees arch overhead.

10.树木在头顶上弯成拱形。

11.The seagulls circled overhead.

11.海鸥在上盘旋。

12.Army helicopters hovered overhead.

12.军用直升机在悬停。

13.A plane flew overhead.

13.一架机从过。

14.The plane flew overhead.

14.机在头顶上。

15.The overhead bird flew away.

15.头上的鸟走了。

16.Two hawks were hovering overhead.

16.两只鹰在头顶盘旋。

17.Compared with the existing schemes, the proposed scheme can rekey real-time, provide a high level of security and reduce communication overhead at the same time.

17.与已有方案相比较，此方案能实时更新组密钥，有着更好的安全性并具有较小的通信开销。

18.It is equipped with asphalt return tube, anti-puffing pressure vent valve, anti-aging overhead nitrogen valve, thermometer, volumeter and output asphalt rapid discharge valve and coupling.

18.配备沥青溢流管、防冒液呼吸阀、防老化顶置充氮阀、温度计、容量计和输出沥青的快速卸料阀及接耦。

19.Air hole, burnthrough, cooapse and welding crackle occurred in the fixed overhead weld for aluminium and aluminium alloy tubes, above all the small-size thin wall tube.

19.针对铝及铝合金管,特别是小口径薄壁管固定口仰焊部位易出现气孔、烧穿、塌陷及焊接热裂纹等问题,分析问题存在的原因,从焊接工艺方面入手,提出一套消除气孔及烧穿的操作手法。

20.Whether grey or blue skies lay overhead, the heft of the waves was always huge – sometimes rhythmic and pleasant, at others offering a waltzer of a voyage.

20.无论头顶上的天是灰色还是蓝色，海上总是波涛汹涌——有时海浪富有节奏感而令人愉悦，有时我们的船就像在海浪上跳华尔兹舞。