Ball part of the garment up in your fist, hold it for a few seconds, and then let it go.

把衣服的一部分团起来捏在拳头里，坚持几秒钟再放开。

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The process of machining ball and spigot includes the following steps: cold extruding the blank to form, heat treatment, cutting and rolling the ball part.

本发明提供了一种球销的加工工艺，该加工工艺按如下步骤进行：坯料冷挤压成型—热处理(调质)—车削—滚压球形部位。

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The ball hit him in the most sensitive part of his anatomy.

这个球打中了他身体的最敏感部位。

《柯林斯英汉双解大词典》

As of March,about fifty of the eighteen thousand students at Ball State were taking part in the Degree in Three program.

VOA: special.2009.07.23

It's not going to be a backscatter event if your ping-pong ball hits the frame or these strings, or the top part.

打到原子核了就是背散射,如果打到框上。

麻省理工公开课 - 化学原理课程节选

What happens is observed and recorded, by the public and the press, so that each hit, each missed swing, each bobble of the ball becomes part of the gorgeously detailed record keeping that so defines the game.

FORBES: Magazine Article

Players must not play the ball with any part of the stick when the ball is above shoulder height (except: defenders are allowed to raise the stick to any height if they are attempting to stop or deflect a shot at goal).

BBC: Our guide to foul play offences in hockey

Presumably believing time was up, the Ulster fly-half casually kicked the ball to the closest part of the touchline and thereby gifted the hosts an attacking line-out.

BBC: Ospreys 16-20 Ulster