1.with a mass of zero
1.In quantum chromodynamics (QCD), hadronic matter is composed of quarks, and interactions between them are mediated by eight massless gluons.
量子色动力学（QCD）是描述物质结构最基本的单元、即夸克与胶子间强作用的规范理论。
2.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。
3.This special property reflects that the massless BTZ black hole is a different phase from that of the generic non rotating BTZ hole.
这反映了无质量BTZ黑洞可能是一种与原始无旋转BTZ黑洞不同的相。
4.Let's call it a massless spring.
我们叫它无质量弹簧。
5.It is attached to a mass hanging off the table by a massless rope over a frictionless table.
它是连接到一个无质量的绳子在一个无摩擦的表挂表的质量。
6.The whole idea gained little attention in the 19th century, since light was thought to be a massless wave, not influenced by gravity.
整个想法在第19世纪自从光被认为是无质量的、不受引力影响以来得到很少的关注。
7.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。
8.A hypothetical massless, neutral elementary particle believed to mediate the strong interaction that binds quarks together.
胶子假设的无质量的中性基本粒子之一，被认为能传递一种把夸克结合在一起的强大的相互作用力量
9.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。
10.We mean a two-particle system with the particles held at a fixed distance from each other by a rigid massless rod of length d.
我们意指一个两粒子体系，粒子之间借助于一长度为d的刚性无质量棒而保持固定距离。