The bending deformation of V-shape composite insulator string under strong wind may cause the risk of ball head falling off and string falling apart.

型复合绝缘子串在大风作用力下受到弯曲变形，有球头脱落造成掉串的风险。

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The built-in ball head allows you to adjust and set its friction so that it balances the weight of your camera without needing locking and unlocking between positions.

嵌入式球形云台可调节和设定阻尼，无需在不同位置间锁定和解锁，即可平衡相机重量。

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He saved one shot when the ball hit him on the head.

他扑住了一次射门，球打在了他的头上。

《柯林斯英汉双解大词典》

During games, pitchers threw the ball at his head.

VOA: special.2009.04.05

Then he would fall down on the floor again like a ball of dirt and start rubbing the side of his head with his back foot as if he had no idea he had been doing any more than any frog might do.

VOA: special.2009.08.29

But concern has been emerging for some time about certain types of metal-on-metal hips, in particular those where the ball head has a diameter of 36mm or more.

BBC: Annual checks for patients with all-metal hips

Other unlikely adornments are the baseball-size orbs sitting atop its legs, evoking traditional Indian ball-head war clubs.

WSJ: Changing Hands | We Are Here! | Native, North American, New | By Lee Rosenbaum

The Spurs goalkeeper was soon shaking his head again at Mido after the Egyptian unsuccessfully tried to clear the ball with his head, requiring Robinson to throw himself to his right to tip away the ball.

BBC: SPORT | Football | FA Cup | Fulham 0-4 Tottenham