1. Our front porch is a favorite place to sit on summer nights.
    我家的前廊是我们夏夜爱坐的地方。

2. One important regulation of the foreign study program has to do with the time, established by the host "parents", by which the teenagers must arrive home on weekend nights.
    留学计划中有一条与时间有关的重要规定，这是由接待家庭的 "父母" 制定的。根据这条规定, 这些十几岁的孩子们在周末晚上必须回家。

3. They fly uninvited into our rooms on summer nights, or beat against our lighted windows.
    夏天的晚上，它们未经邀请便飞到我们房间里，或者对着露出亮光的窗户乱扑乱撞。

4. If one group of people were disturbed from their eye-movement sleep for several nights on end,
    如果有两组人，一组人连续几夜在眼球队活动时被叫醒；