All of us can pack a healthy lunch for our son, or go outside and play ball with our daughter.

我们都能为儿子收拾干净的午餐，或外出与女儿一起玩球。

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One day, physicist Ho-Kei Chan of Trinity College Dublin was playing with steel ball bearings, trying to pack them into a little cylindrical tube in the most efficient way possible.

一天，都柏林大学圣三一学院的物理学家陈和奎正拿着一些铁珠玩耍，试图将他们以最有效的方法装进一个小的圆柱型管子里。

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Your game's set of tools includes a moving racket and a ball, but the features are different in each game of the pack.

您的游戏的一套工具，包括一个移动球拍，一个球，但特点不同，在每场比赛的包。

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"They are a strong team with good backs and some strong ball carriers in their pack, " he said.

BBC: Tigers aiming for treble - Flood

"Over the years, our pack could create ball, but we just didn't always have the nous to score the tries, " added Bulloch.

BBC: Scots need spirit of 1999

The notoriously nervy Holt looked to have lost the plot when he careered the cue ball off a cushion into the pack of reds at high speed.

BBC: CHOOSE A SPORT