1. Equations are generally written with an equal sign. 等式通常用等号来写。
2. Einstein's equations showed the universe to be expanding. 爱因斯坦的方程式表明宇宙正在扩大。
3. You've got to juggle the two equations, multiply that by 4, multiply that by 3, add and subtract and so on. 你必须联立这两个方程，一个乘以4，另一个乘以3，再加减等等。
4. The method is that designing theory is simpleness and being understood is easy and avoiding complexity computation on state equations and drive equations. 该方法设计理论简单易懂，避免了状态方程和驱动方程的复杂计算。
5. Einstein discovered to his horror that Hilbert had taken what he had learned from Einstein's lectures and was racing to come up with the correct equations first. 爱因斯坦惊恐地发现，希尔伯特把他从爱因斯坦的讲座中学到的东西都拿来了，而且还在争先恐后地首先提出正确的方程式。
