简单来说，它是一个集成在 Firefox 侧边栏里的小型编程工具。它的核心理念是为 Web 提供“最终用户编程（End-user programming）”。它提供了一系列像 enter（输入）和 click（点击）这样的宏命令。你可以输入 ...

Physics is the search for and application of rules that can help us understand and predict the world around us. Central to physics are ideas such as energy, mass, particles and waves. Physics attempts ...