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。
Often the acoustics make it hard to identify where sounds are coming from.
这种声学效果通常会使得声音的来源难以辨别。
Often the best ideas for big changes come from unexpected places—it's just a matter of tuning in.
大变革的最佳理念往往来自于意想不到之处——这只是个协调优化的问题。
Lower mountains tend to be older, and are often the eroded relics of much higher mountain chains.
海拔较低的山脉往往更古老，且通常是比它高得多的山脉的侵蚀遗迹。
Unfortunately for them (and often the taxpayers), our energy systems are a bit like an aircraft carrier.
不幸的是，对于他们，通常是纳税人来说，我们的能源系统有点像一艘航空母舰。
As is often the case with elderly people, grandpa talked about my new hair style for at least 50 minutes.
就像老年人经常做的那样，爷爷至少花了50分钟谈论我的新发型。
These are often the lower areas of the reef, those located in deeper water, where temperatures are lower.
这些通常处于珊瑚礁低处，即在温度更低的深水域处。
Often the interviewer will need to play devil's advocate in order to get a discussion going.
采访者常常需要故意唱唱反调以使访谈继续下去。
I wonder how often the students have a physical examination.
我想知道学生们多久进行一次体检。
It is often the case that anything is possible for those who hang on to hope.
通常情况下，对那些坚持希望的人来说，一切皆有可能。
Those are often the T-shirts that we feel the most comfortable in and that we wear again and again.
这些通常是我们觉得最舒服的 T 恤衫，我们会一遍又一遍地穿。
You may not want to hear it, but those who always push you hard in your life are often the ones telling you they still love you and care about you, and want to make you better.
你可能不想听，但是那些在生活中总是把你逼得很紧的人，往往会告诉你，他们仍然爱你，关心你，想让你变得更好。
Often the foragers proceeded to the exact spot in the maze where the food had been.
觅食者经常会直接进入到迷宫中食物所处的准确地点。
Often the most influential developments initially appear to be of minor significance.
最具影响力的事态发展最初往往显得无足轻重。
Often the talk was interrupted by exclamations of surprise from grandmama, who still believed it was all a dream.
谈话常常被奶奶惊讶的惊叫声打断，她仍然相信这只是一场梦。
As is often the case with human beings, many animals sleep a lot when young, but sleep much less when they get older.
和人类一样，许多动物年幼时睡得多，但长大后睡少了很多。
In America, it is often the judges, rather than the politicians who make the big decision that will effect people's life.
在美国，能够做出影响人们生活的重大决定的人往往是法官，而不是政治家。
Often the rapid and diffuse movements of the infant make it difficult to get an accurate record of the number of responses.
婴儿快速而散乱的动作常常使得准确记录反应数量变得困难。
Newspapers are often the most important form of news for a local community, and they develop a high degree of loyalty from local readers.
报纸通常是当地社区最重要的新闻形式，它们培养了一批高度忠诚的当地读者。
Defends bath crock, closestool, these seemingly no character defends bath products is often the most can reflect the female's characteristics.
马桶、浴缸这些看似没有个性特征的卫浴产品却往往最能体现女性的特质。
Maitland observed that legal documents are the best—indeed, often the only—available evidence about the economic and social history of a given period.
梅特兰观察到，法律文件是关于某一特定时期的经济和社会历史的最好的——事实上，往往是唯一可用的证据。
UNAMA said the torture aimed to obtain information and confessions, which it said are often the sole form of evidence submitted in Afghan criminal trials.
联阿援助团说，酷刑的目的是获取信息和口供，在阿富汗的刑事审判中，信息和口供往往是唯一的证据。
Often the cheapest way to provide irrigation water in the dry tropics is through small-scale projects, such as gathering rainfall in depressions and pumping it to nearby cropland.
在干旱的热带地区，提供灌溉水的最低成本的方法通常是建造小规模的工程。例如，在洼地收集雨水，然后将其抽调至附近的农田。
Often the advantages of convenient, mobile technology are both obvious and taken for granted, leaving more subtle topics for concerned discussion: are smartphones disturbing children's sleep?
通常来说，这种技术便捷又可移动，其优势既是显而易见的，也被认为是理所当然的，留下了更多微妙的话题供人们讨论：智能手机是否会干扰儿童的睡眠？
Even though scientists play a part in transmitting information to journalists and ultimately the public, too often the blame for ineffective communication is placed on the side of the journalists.
尽管科学家在将信息传递给记者、最终把信息传递给公众方面发挥了一定作用，但人们往往还是将无效沟通归咎于记者。
Often the latifundia are surrounded by privately-owned small plots or minifundia.
大庄园经常被私人所有的小地块或称小庄园所包围。
Yet often the money comes with strings attached.
然而这些钱往往带有附加条件。
Often the accusations included charges of Satanism.
通常这些指控中包含了对于撒旦崇拜的控诉。
Often the accusations included charges of Satanism.
通常这些指控中包含了对于撒旦崇拜的控诉。
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