你只能在夜晚研究这些动物。
"You can study the animals only during the night," said Sathyabhama d.
李婉因为是个鬼﹐只能在夜晚里来天亮前又必须离开。
As a ghost, Li Wan could only come in the evening and must leave before dawn.
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.
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