If headaches only occur at night, lack of fresh air and oxygen is often the cause.
如果头痛只发生在晚上，缺少新鲜空气和氧气常常是其原因。
An elderly person may nap during the day and then sleep only five hours a night.
上了年纪的人白天会小睡一会儿，然后晚上只睡5个小时。
The only serious difficulty in this work is that it's sometimes dangerous to drive at night.
这项工作中的唯一难题是有时在夜里开车很危险。
In the time when the dinosaurs dominated the daytime economy, our mammalian ancestors probably only managed to survive at all because they found ways of scraping a living at night.
在恐龙主宰着白天的局势的时代，我们的哺乳动物祖先之所以能够勉强生存下来，可能只是因为他们找到了在夜间谋生的方法。
Both these devices worked well in sunny climates; but in northern Europe, the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night.
这两种装置在阳光充足的气候条件下工作良好；但在北欧，太阳可能一次被云层遮挡数周，而温度不仅随着季节变化，而且还随着昼夜变化。
I think about the five days of pure rain, where people were soggy at the first night and it only got worse.
我想到了那次连续五天的瓢泼大雨，人们在第一天晚上都湿透了，状况越来越糟。
That night God did so. Only the fleece was dry, all the ground was covered with dew.
那晚，神也是这么做的。只有羊毛是干的，遍地都有露水。
When they bade him good-night, he only ran away, beating the air with his stick.
当她们向他道晚安时，他只是跑开了，用鞭子在空中乱打。
I had to spend the rest of the night trembling in the only dry part of my tent.
后半夜，我都不得不在帐篷里干的那块地方瑟瑟发抖。
During the year, Vicuna's hotels accommodate thousands of tourists who come from all over the world to see the night sky as they have only seen it in books.
一年里，维库纳的酒店容纳了成千上万名游客，他们从世界各地来这里看只在书上看过的夜空。
So far, the only witness is a computer engineer, who worked late that night.
目前为止，唯一的目击者是一名电脑工程师，他当晚工作到很晚。
"The Only", a popular rock band from America, will give their first concert this Saturday night, at 7:00 p.m. at Golden Hall.
来自美国的流行摇滚乐队“唯一”将于本周六晚上7点在金色大厅举行他们的首场演唱会。
As the night wore on, people began to close their eyes, but the seats were so uncomfortable that only a very heavy sleeper could manage to get any rest.
夜渐渐深了，人们开始闭上眼睛，但是座位太不舒服了，只有睡得很沉的人才能设法获得休息。
Furthermore, driving a camping car during one's travels and sleeping in the vehicle at night is just like home? Only mobile!
此外，一路开着露营车旅行，晚上就住在车里，这就更像是真正的家了——只不过能移动而已！
The three bedrooms have wall-mounted heaters, which are used only when the rooms are occupied, and switched off at night.
三个卧室里装了壁挂式供暖装置，只在房间有人的时候打开，而且夜间也是关闭的。
The only real solution appears to be to hand over the night shift to a corps of permanent night workers whose nocturnal wakefulness may persist through all weekends and holidays.
唯一能解决问题的方法是将夜班交给一些长期从事夜间工作的人,,他们在周末和假期依然会保持警醒状态.
The only fertilizer they have is night soil -- human sewage -- which they collect in ox-drawn carts.
他们唯一的肥料就是粪便-他们用牛车来拉。
She had played Mah-Jong for 8 h the previous night and had only drunk a small amount of soft drink during this time.
患者前夜玩了8小时的麻将，期间仅摄入少量软饮料。
Hadn't he gamely told the story, not only to me but to all of the dinner guests that night?
要是他没有好玩似的把这个故事告诉我，告诉那天晚上的所有宴会上的客人？
In Vienna, he sneaked into night classes at the Technical University, the only 'formal' engineering education he ever obtained.
在维也纳，他潜入技术大学夜班上课，这是他获得唯一的正式工程教育。
The research focuses on a specific form of nitrogen oxides present only at night — during the day it is broken down by even the faintest sunlight.
这项研究集中于只在夜间出现的一种氮氧化物的具体形式，这种氮氧化物在白天即使阳光极微弱也会被分解。
The hedgehog only comes out at night to scurry around for a meal.
刺猬只在夜间出来，到处匆匆地转，找寻食物。
It's was Boston's first title since the passing of Auerbach, whose signature victory cigar was the only thing missing on this night.
这是波士顿在奥尔巴赫逝世后第一次夺冠。整个夜晚唯一缺少的，也就是他标志性的夺冠后的雪茄。
That sometimes created confusion — Ellison openly described to Wilson an incident in which a woman employee arrived at the executive's house one night, only to find another girlfriend-employee there.
这有时候会造成困惑—埃里森公开向威尔森承认，曾发生过一次事故，一天晚上，其中一名女员工来到执行官办公室，却发现其另一名员工女友也在那里。
To my recollection we have been there for a dance only once – on the night of Lindi’s wedding reception.
我只记得我曾在那儿跳过一次舞 —在林蒂的婚礼招待晚会上。
Have your husband or family member make the kids' school lunches the night before. They won't be the freshest, but it's only for a few days.
可以要你的丈夫或者家里其他人在前一晚准备好孩子第二天要在学校吃的午餐，虽然这些午餐不及早上做的新鲜，但是，这只是暂时的。
That night God did so. Only the fleece was dry; all the ground was covered with dew.
这夜神也如此行，独羊毛上是干的，别的地方都有露水。
Lyushnya admits that this preternatural environment can be nerve-wracking, especially when he's the only one working the night shift.
卢沙恩亚承认这种异常环境会让人神经崩溃，尤其是他一个人值夜班的时候。
Lyushnya admits that this preternatural environment can be nerve-wracking, especially when he's the only one working the night shift.
卢沙恩亚承认这种异常环境会让人神经崩溃，尤其是他一个人值夜班的时候。
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