摘要： When children start school for the first time, parents often feel a sense of excitement coupled with a touch of sadness at the end of an era. This is 阅读全文

摘要： It is 2050. Space tourism has become a reality. 现在是2050年。太空旅游已经成为现实。 So would you want to be a space tourist? 那么你想成为一名太空游客吗？ Here, some middle school 阅读全文