nighttime       
noun [ U ] uk/ˈnaɪt.taɪm/ us/ˈnaɪt.taɪm/
 夜间,夜晚
the time in every 24-hour period when it is dark
  It's pretty noisy at nighttime. 夜间很吵。 
 a nighttime curfew 宵禁 
 See also: night noun
 
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