That work became an important piece of evidence that dark energy — the mysterious force propelling the acceleration of the universe outward — actually exists.
这项工作成了暗能量（这是推动宇宙向外加速的神秘力量）确实存在的一个重要证据。
2
Velocity is a vector and acceleration is a vector and today we're going to learn how to work with these vectors.
速度是个矢量，加速度也是个矢量，今天要来学学，如何处理矢量。
3
With the acceleration of the rhythm of people's lives, increasing work pressure, people want more stability and a comfortable life. Life safety of the working environment more and more attention.