However, in order for this unification to work mathematically, it requires that force-carrying particles have no mass.
不过，为了使这二者的统一符合数学计算，需要负责传递力的粒子质量为零。
Einstein called the something the cosmological constant and added it to his theory with some distaste, because the work had been so mathematically beautiful without it.
爱因斯坦将其称为宇宙常数，并略带厌恶地将它加入他的理论，因为如果没有宇宙常数，它的理论在数学上优美极了。
This article explains how luck, hard work and success are related in mathematically simple way.
这篇文章就从简单的数学原理出发，来解释运气，努力工作和成功的联系。
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