Science has shown us through measurement, observation and experimentation that there are four forces in the Universe: electromagnetism, stronginteraction, weak interaction and gravitation.
科学早就通过测量、观察和实验告诉我们宇宙中有四种力：电磁力、强相互作用力、弱相互作用力和万有引力。
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Usually photons don't interact with each other. With this scheme we may be able to achieve a long sought goal: stronginteraction between photons, mediated by a single atom.
参与该实验的博士生 Martin Mücke说，“通常光子不会有相互作用，用这种方法我们也许达成了期待已久的目的：用一个原子作为介质，实现光子相互间的强烈作用。
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Spin effect in high energy reactions is powerful tool to study the properties of stronginteraction.