n the time after sunset and before sunrise while it is dark outside
n. 夜间
1. I love to watch the stars at nighttime.
我喜欢在夜晚看星星。
2. The park is very quiet at nighttime.
公园在夜晚非常安静。
3. She likes to read books before going to sleep at nighttime.
她喜欢在夜晚睡觉前看书。