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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。
