四种基本力（万有引力、电磁力、强核力和弱核力）中的每一种都有一个理论上的旋钮。
Each of the four fundamental forces (gravity, electromagnetism, and the strong and weak nuclear forces) has a kind of theoretical knob.
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。
Science has shown us through measurement, observation and experimentation that there are four forces in the Universe: electromagnetism, strong interaction, weak interaction and gravitation.
科学家将这个现象归因于暗能量——与万有引力相抵触的一种力。
Scientists attribute the phenomenon to dark energy, a force that repels gravity.
众多重要发现贯穿了整个十七世纪，但最具科学影响力的无疑是牛顿的万有引力理论。
Important discoveries happened throughout the 17th century, but the most influential scientific advance was Newton's theory of gravity.
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.
现代物理学认为宇宙中存在4种力：电磁力、万有引力、强力和弱力。
Modern physics thinks that there are 4 kinds of force in the universe: electromagnetic force, gravitation, strong force and weak force.
牛顿的万有引力定律指的是两个质点之间的力。
Newton's law of gravitation refers to the force between two particles.
我们知道，宇宙中只有万有引力和电磁力这两种长程力。
As you know, only universal gravitation and electromagnetic force are long-distance force in the universe.
在自然界里，人们已发现了四种力：万有引力，电磁力，强力，弱力。
In the natural world, people have discovered four kinds of forces: the electromagnetic force, the gravitation, the weak force, and the strong force.
在自然界里，人们已发现了四种力：万有引力，电磁力，强力，弱力。
In the natural world, people have discovered four kinds of forces: the electromagnetic force, the gravitation, the weak force, and the strong force.
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