tranquilly       
adverb uk/ˈtræŋ.kwɪ.li/ us/ˈtræŋ.kwɪ.li/
 安静地,平静地;安宁地
calmly, and without noise, violence, worry, etc.
  He said voters should go to the polls calmly and tranquilly. 他说选民应该冷静平和地去投票。 
 " No one takes much notice of them," he added tranquilly. “没有人注意到他们,”他平静地补充说。 
 See: tranquil
 - More examples
 - Throughout the day they conversed tranquilly together.
 - She was tranquilly watching television, an infant asleep beside her.
 - The frenzy is over, and life goes on smoothly and tranquilly as before.