Novas and Supernovas新星和超新星Novas and supernovas are all variable stars created by nova outbursts.During a nova outburst, the brightness may increase over the course of a few days by several thousand or even dozens of thousands of times.Then...
Water is our simplest nutrient. It requires no more preparation than turning on a tap. We know when we need to drink it because we feel thirsty. Fully functioning adults tend not to forget to drink enough water to survive.对我们来说，水是最简单的养分。...
Bill Gates has opened a personal account on the popular Chinese social media platform WeChat, greeting Chinese fans in clumsy Chinese in his first post dated.近日，比尔·盖茨通车了自己的微信账号，并在公布的第一份引文中用略为贞生涩的中文向中国粉丝们问候。...
