倒钩球的英文：
overhead volley
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。