1.A Russian billionaire has attended his inauguration as leader of humankind's first ever nation in space.
inauguration 就职典礼
Everyone watched the inauguration of the new president.
每个人都观看了新总统的就职典礼 。
2.Around 200,000 people have signed up to claim their Asgardian nationality.
sign up 签约;报名参加
I waited an hour to sign up for a distance-learning course.
为了注册远程教学课程,我等了一个小时 。