As they pass through, they trace out an arc, just like a thrown ball falling due to gravity.

当中子穿越平板时，它们划出一道弧线，就像投出一个小球一样。

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At last, the author obtained the equation of ray trace in the GRIN ball lens with the index profile which is quadratic and drew some important conclusions.

研究了二次抛物线型的GRIN球透镜的光线轨迹方程序；得出其轨迹为椭圆曲线及一些重要结论。

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A brief introduction about test operation, the judgment of the pressure trace, the impact factors of the ball pressure test in the medical devices area…

对医疗器械产品中球压试验的操作、压痕判定、影响试验的因素进行简要论述。

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As they pass through, they trace out an arc, just like a thrown ball falling due to gravity.

BBC: Neutrons could test Newton's gravity and string theory

Because kits are now distributed to fewer centres and every ball is coded (so that inspectors can trace strays), manufacturers have better control of production.

ECONOMIST: Ending child labour can have unexpected consequences