Well, as you all know, there are four fundamental forces in physics: electromagnetism, strong nuclear interaction, weak nuclear interaction and gravity.

众所周知，在自然界中有四种基本的相互作用力：电磁力、强相互作用力、弱相互作用力和万有引力。

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A cloud chamber experiment is described, in which the angular distribution of secondary particles produced in nuclear interaction by high energy cosmic ray particles with paraffin has been studied.

本文描述一个利用云室研究高能宇宙线粒子与石蜡的核作用中次级粒子角分布的实验。

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MRI, first developed 30 years ago, is based on a well established scientific technique, nuclear magnetic resonance, which uses the interaction of magnetic fields with the spin of the nuclei of atoms to provide detailed information on the constituents of chemicals and biological materials.

BBC: Study into health impact of MRI