jubilantly       
adverb uk/ˈdʒuː.bəl.ənt.li/ us/ˈdʒuː.bəl.ənt.li/
 (尤指因成功而)欢欣地,喜气洋洋地
in a way that shows or involves great happiness, especially because of a success
  As she reached the finishing line, she jubilantly threw up her arms. 当她到达终点线时,她欢欣地举起了双臂。 
 People were jubilantly celebrating in the streets. 人们在街上喜气洋洋地举行庆祝活动。 
 See: jubilant
 - More examples
- "Joy to the World," he sang jubilantly.
- Researchers yesterday jubilantly announced a landmark gene therapy experiment.
- Tens of thousands of demonstrators jubilantly shouted in unison.