想象一下台球的运动，一个球对另一个球的撞击。

Think about the motion of billiard balls, one billiard ball bashing into another.

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背景：已往研究表明，神经生长因子微球对脊髓损伤的修复有促进作用。

BACKGROUND: Studies have shown that nerve growth factor microspheres can promote repair of spinal cord injury.

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在得到巧克力球对人体健康有益的结论之前，零食家们也许会思考一下研究的不足之处。

But before concluding that a box of Godiva truffles is health food, chocolate lovers may want to consider some of the study's weaknesses.

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You know, your mother always told you to eat brussels sprouts because it was good for you.

你知道的，你的母亲经常会,让你们吃球芽甘蓝,因为这对你身体有好处。

麻省理工公开课 - 计算机科学及编程导论课程节选

What does it feel like to be the machine while it's looking at-- while it's got its little light sensors pointed at--the red ball?

当机器以电子眼,对着那个红色的球,它会有什么样的感觉

耶鲁公开课 - 死亡课程节选