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.
在一个线性测量中，每一个光子可以单独地与原子进行相互作用，这样得到的是一个相对较弱的信号。
In a linear measurement, each photon would interact separately with the atoms, resulting in a relatively weak signal.
然而，由于电感和测量仪器的相互作用，这种测量通常比较困难。
However, the measurements are often difficult because of the interaction between the inductance and the measuring instrument.
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