中微子和假想的引力子也是无质量粒子, 它们也以与光相同的速度运动.Neutrinos and the hypothetical gravitons, also massless particles, move at the same speed as light.在本文中, 只简单的讨论了在树图近似下引力子的相互作用势能.In this paper, the interactional potential energy of gravi...
指数可以用于反映一组变量的综合变化.A single index may reflect a composite, or group, of changing variables.在热力学中,我们经常涉及两个或更多变量的函数.In thermodynamics we usually deal with functions of two or more variables.外生变量可以包括内生变量的后滞值.Exogenous variab...
他们的床都各具特色；马克的床是张带球形黄铜柱头的铁家伙。All their beds were distinctive; Mac'swas an iron affair with brass knobs.这种球形种子荚里含有大量的小种子。The globular seed capsule contains numerous small seeds.雪在马蹄下积成球形.The snow balled undcr the hors...