重力和其它基本作用力如电磁力之间的关系，是物理学长期以来最引人关注的奥秘之一。
One of the longest outstanding mysteries in physics is how gravity is related to the other fundamental forces, such as electromagnetism.
科学家们认为，万有引力、电磁力、弱力和强力是宇宙中的四种基本作用力。
Scientists believe that gravity, electromagnetic force, strong nuclear force and weak nuclear force are the Four Basic Forces of the universe.
这项特色是很受人欢迎的，因为它精确地吻合所有已知基本作用力载体（如传播电磁力的光子以及重力的重力子）的性质。
This feature is very welcome because it precisely matches the properties of the carriers of all known fundamental forces, such as the photon (for electromagnetism) and the graviton (for gravity).
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