用户每个月必须缴纳25美元以享受无限时通话，并且他们需要有台高清电视和互联网接入，以期能达到更好的通话质量。
Users also have to pay $25 a month for unlimited calls. And they need a high-definition television set as well as a fast internet connection to get good results.
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.
事实上，对象具有质量，根据爱因斯坦的理论，不管是人们的汽车，还是中微子，都不可能达到光的速度，因为它们要这样做就需要无限大的能量。
In fact, objects with mass, be they cars or neutrinos, can't reach the speed of light because they would need infinite energy to do so, according to the theory.
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