It is thought that the train hit a boulder that had fallen down a cliff on to the track.
人们认为这列火车撞到了从悬崖滚到铁轨上的大圆石。
It is thought that these grooves help to channel water through the mouth and out the gill slits, thereby reducing water resistance.
人们认为这些沟槽有助于将水从嘴中输送到鳃裂外，从而减少水的阻力。
It is thought that being overweight may also increase the risk of cancer in the reproductive organs for women and in the prostate gland for men.
人们认为，超重还可能增加女性生殖器官和男性前列腺患癌的风险。
It is thought attendance figures in the US and Canada will rise next year, when sequels to the hit comedies The Hangover and Pirates of the Caribbean are released.
人们认为明年美国和加拿大的上座率将会上升，届时热门喜剧《宿醉》和《加勒比海盗》的续集将会上映。
Teachers, it is thought, benefit from the practice of reflection, the conscious act of thinking deeply about and carefully examining the interactions and events within their own classrooms.
人们认为，教师从反思的实践中受益，反思是一种深入思考并且仔细检查在他们教室内发生的交流和活动的有意识的行为。
It is thought to be healthy to do so when the weather is changing.
人们认为在天气变化的时候这样做有益健康。
Therefore, DIY can bring us fun and help us save money, but it is not always as easy as it is thought to be if we bite off more than we can chew.
因此，自己动手做（DIY）可以给我们带来乐趣，帮助我们省钱，但如果我们不自量力，它并不总是像想象的那么容易。
In the paper, he and his colleagues used the example of cystic fibrosis, which is underdiagnosed in people of African ancestry because it is thought of as a "white" disease.
在这篇论文中，他和他的同事以囊胞性纤维化为例，它在非洲血统的人群中诊断不足，因为它被认为是一种“白人的”疾病。
It is thought that the smaller galaxy has actually passed through the larger one.
据认为，较小的星系实际上穿过了较大的一个。
It is thought that more than 400 have gone missing in the last financial year alone.
而仅去年一财年就有超过400人不知去向。
It is thought that no coal plant of this size has been converted anywhere in the world.
在世界范围内，目前还没有一个如此规模的煤炭工厂转型成功。
The attack appeared to be unprovoked and it is thought the killer did not know his victim.
此次袭击看似一起无故发生的事件，并且据说凶手并不认识遇害者。
It is thought that our memory of what we have eaten plays a key role in dampening appetite.
据认为，记忆在进食过程中有着重要的作用，它能抑制我们的食欲。
It is thought that exposure to allergens - from cats and dogs - could boost the immune system.
这是因为从猫和狗那里接触过敏原，能够增强人们的免疫力。
It is thought that the first machines will be built in 2013-14 following two years of testing.
预计在经过c两年试验后，第一台机组将于2013-2014年建成。
It is thought to date from about 700 AD and to be an example of ancient Peruvian Mochica civilisation art.
该头饰的制作年代被认为可以追溯到公元700年左右，它可能是古代秘鲁莫奇·卡文明艺术的代表。
Zipcar already has 400, 000 members, mostly in America where it is thought to have 80% of the market.
Zipcar公司已拥有40万成员，大多在美国，在美国拥有80％的市场份额。
It is thought this is because the left side of the brain processes sounds that come in through the right ear.
研究者认为，这是因为人的左脑主要负责处理从右耳传入的声音。
It is thought very unlucky to have the feathers of a Peacock within the home or handle anything made with them.
人们认为如果家中有孔雀羽毛或拿着孔雀羽毛制作的东西，那是相当不吉利的。
It is thought that one of the reasons we splash our cash or help others is simply because it makes us feel good.
人们认为，这其中的一个原因就是我们挥金如土或者帮助他人，也仅仅只是因为花钱这个行为能够让我们感觉良好，本意并非为他人着想。
It is thought that many firms are reluctant to report cyber attacks out of fear that it would damage their reputation.
很多公司被认为由于担心损害自己的信誉而不愿举报网络攻击。
It is thought that the human brain grew so large, and our species became so clever, as our social groups expanded.
人类大脑成长到如此之大，我们的物种变得如此聪明，这都是因为我们的社交组织得到了扩展。
It is thought that sulphur produced by volcanoes erupting led to oxygen disappearing from large areas of the oceans.
据认为，由火山喷发产生的硫磺使氧气从大片海域消失。
It is thought the elderly may have better resistance because their immune systems recognise the virus from past infections.
鉴于老人的免疫系统能够从过去的传染病例中识别出猪流感病毒，老人被认为具有较低的感染几率。
It is thought that high levels of fat raise the odds of the arteries clogging up, cutting the flow of blood and oxygen.
高水平的脂肪含量会使得动脉更易堵塞，并降低了血液与氧气的流动。
It is thought that high levels of fat raise the odds of the arteries clogging up, cutting the flow of blood and oxygen.
高水平的脂肪含量会使得动脉更易堵塞，并降低了血液与氧气的流动。
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