你只能在夜晚研究这些动物。
"You can study the animals only during the night," said Sathyabhama d.
在传统家庭里，她们被禁止说话，甚至只能在夜晚关上卧室门后，才能通自己的丈夫讲话。
In traditional households they were forbidden to speak even to their husbands, except behind closed doors in the bedroom at night.
对挂放国旗的规定确保了美国国旗能得到恰当的尊重，国旗只能在日出和日落期间悬挂，除非在夜晚有聚光灯照明。
Guidelines for displaying the U.S. flag help make sure the flag is given proper respect. The flag should only be displayed from sunrise to sunset, unless it is lit by a spotlight at night.
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