辐射：由以光速运行的无质量或近无质量粒子所构成。
Radiation: composed of massless or nearly massless particles that move at the speed of light.
如果宇宙中的所有粒子都是无质量，那么宇宙对于他们就会是初始时那样无限小，并且无限小的宇宙会经历一次大爆炸。
If all particles in the universe were massless, then, the universe would look to them to be infinitely small. And an infinitely small universe is one that would undergo a Big Bang.
在费米弱作用理论乃至弱电统一理论中，都是把中微子当作无静止质量的粒子来处理的。
In the Fermi weak interaction theory and even in the electro-weak unification theory, the neutrino is looked as the massless particle.
人们将“电磁吸引力”“描绘成”是由于“称作”“光子”的“无质量的”自旋为1的“粒子”的交换所引起的。
The electromagnetic attraction is pictured as being caused by the exchange of large Numbers of virtual massless particles of spin 1, called photons.
发现中微子(几乎是无质量的粒子)在离开太阳之前可转化介子，解开了一个40年的谜。
A discovery that neutrinos, virtually massless particles, convert into other forms known as muon and tau before they leave the sun, solving a 40-year-old mystery.
而光谱加速度大致上是一座建筑物承受的加速度，科学家把一颗与目标建筑物具有相同自然频率的粒子放在一个近似无质量的垂直控制棒上进行模拟得出此数据。
SA (spectral acceleration) is approximately what is experienced by a building, as modeled by a particle on a massless vertical rod having the same natural frequency of vibration as the building.
而光谱加速度大致上是一座建筑物承受的加速度，科学家把一颗与目标建筑物具有相同自然频率的粒子放在一个近似无质量的垂直控制棒上进行模拟得出此数据。
SA (spectral acceleration) is approximately what is experienced by a building, as modeled by a particle on a massless vertical rod having the same natural frequency of vibration as the building.
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