Radiation: composed of massless or nearly massless particles that move at the speed of light.
辐射：由以光速运行的无质量或近无质量粒子所构成。
If all particles in the universe were massless, then, the universe would look to them to be infinitely small.
如果宇宙中的所有粒子都失去质量，那么对于这些粒子来说宇宙便会变得无穷小。
They are very nearly massless and thus, even at moderate energies, we'd expect them to travel essentially at the speed of light.
它们的质量非常接近零，因此，即使在中等能量下，我们也希望它们以光速传播。
Take the recent question of whether neutrinos, a type of near-massless subatomic particle, can travel faster than light.
请看最近的一个热点问题：中微子的传播速度能否超过光速？ 中微子是种亚原子粒子，几乎没有质量。
A massless rope is wrapped around a hollow cylinder of radius 12 cm whose central axis is fixed in a horizontal position.
一个无质量的绳子缠在一个半径为12厘米的空心圆柱上，其中心轴固定在一个水平位置。
In the Fermi weak interaction theory and even in the electro-weak unification theory, the neutrino is looked as the massless particle.
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 addition, the applicability of the widely used massless foundation approach to the dam-foundation interaction analysis is discussed.
此外还讨论了工程中广泛应用的无质量地基模型对于相互作用分析的适用性问题。
The electromagnetic attraction is pictured as being caused by the exchange of large Numbers of virtual massless particles of spin 1, called photons.
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。
Considering the background of massless neutrino, probes into the effect of the background field on the gravitational field of a global cosmic string outside the core.
考虑静质量为零的中微子背景，探讨背景场对整体宇宙弦核外引力场的影响。
Massless particles, including photons, the quanta of electromagnetic radiation, and others, were mentioned in Section 8-8.
没有质量的粒子，包括光子﹑电磁辐射的量子，等等，已在8 - 8节有所叙述。
Massless particles, including photons, the quanta of electromagnetic radiation, and others, were mentioned in Section 8-8.
没有质量的粒子，包括光子﹑电磁辐射的量子，等等，已在8 - 8节有所叙述。
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