That is about 194 trillion(万亿)kilometres -500 million times farther away from us than the moon. A spacecraft traveling at a one-tenth of the speed of light would reach Gliese 581g within about 220 years. A human can’t live that long but robotic explorers could make the job easier. ...
One day the employees of a large company in St Louis, Missouri returned from their lunch break and were greeted with a sign on the front door. The sign said: "Yesterday the person who has been hindering ((阻碍) your growth in this company passed away. We invite you to join the funeral...