1.Crows cawed from the poplar trees overhead.

1.白杨树的乌鸦空呱呱乱叫。

2.A great congregation of birds flew overhead.

2.一大群鸟从头飞过。

3.Vultures circled overhead as the lions fed.

3.狮子进食的时候，禿鹫空盘旋。

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

4.天的许多星星是肉眼看不到的。

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

5.昨晚那个房间的人很吵。

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

6.虽然乌云密布, 但很幸运地一整天都没下雨。

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

7.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。

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

8.头的大空晴朗无云，林梢晨光下泛着一抹玫瑰红。

9.The trees arch overhead.

9.树木头顶弯成拱形。

10.The seagulls circled overhead.

10.海鸥空盘旋。

11.Army helicopters hovered overhead.

11.军用直升机空中悬停。

12.A plane flew overhead.

12.一架飞机从空中飞过。

13.The plane flew overhead.

13.飞机头顶飞。

14.Heavy overheads reduced his profits.

14.经费开支大因而减少了他的利润。

15.The overhead bird flew away.

15.头的鸟飞走了。

16.Two hawks were hovering overhead.

16.两只鹰头顶盘旋。

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.与已有案相比，案能实时地更新组密钥，有着更好的安全性并具有小的通信开销。

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,分析问题存的原因,从焊接工艺面入手,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.无论头顶的天空是灰色还是蓝色，海总是波涛汹涌——有时海浪富有节奏感而令人愉悦，有时我们的船就像海浪跳华尔兹舞。