Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.

对于打哈欠是由血液中的氧气减少或血液中的二氧化碳增加引起的这种观点，一些实验也同样提出了严重的质疑。

This latest evidence casts serious doubt on his version of events.

最新的证据使人们十分怀疑他对事件的说法。

As for the effectiveness of markets, this has surely not been called into serious doubt.

至于市场的有效性，当然还没有遭受严重质疑。

However, there is now accumulating evidence that casts serious doubt on the existence of the phenomenon.

然而，越来越多的证据对此现象的存在提出了深深的怀疑。

There is no doubt Gates' work is saving lives, but there are serious doubts about its long-term effectiveness.

毫无疑问，盖茨基金帮助了很多人，但它是否具有长久的生命力还是未知数。

A industry insider said: "Daniel's commitment to this project really makes his return as James Bond a serious doubt."

一位业内人士评论说：“此次丹尼尔出演美剧的决定，意味着他继续出演詹姆斯·邦德一角的可能性有所动摇。”

This is a kind of loneliness which Serious doubt the truth of life but insubordination, it likes foreordination and makes people can't resist.

这是一种对生活真相产生的严重怀疑但却不愿屈服的孤独，如同宿命一般让人无法抗拒。

The survival of the common European Union currency, free movement across national borders and trans-Atlantic collective security are all in serious doubt.

通用欧盟货币和跨国自由流动政策的存亡，以及跨大西洋的集体安全值得严重怀疑。

Britain’s Financial Reporting Council has suggested a fourth alternative, that would express “serious doubt” about the ability of the company to continue as a going concern.

英国财务报告委员会提出了第四种处理方式，对公司持续经营可行性提出认真的疑惑。

Of the top 19 Banks in the nation, the top five (5) largest Banks are under capitalized so dangerously, there is serious doubt about their ability to continue as ongoing businesses.

最高19家银行在全国前五位(5)最大的银行正在利用这样危险，存在着严重的怀疑，他们有能力继续担任目前的业务。

There was no doubt he was serious, it wasn't just playing around.

无疑，他是认真的，而不是在闹着玩。

There was no doubt in his mind that the man was serious.

毫不怀疑在他的脑海里这个人是认真的。

We do not doubt that teachers who also coach face serious tradeoffs that likely come at the expense of time they could dedicate to their academic obligations.

我们不怀疑，同时兼任教练的教师也面临着严肃的权衡，也许是以牺牲时间为代价，他们原本可以把这些时间用于完成学术义务。

Though he is not a scientist, he had struck out evidence that glaciers were retreating and inserted phrases suggesting that there was serious scientific doubt about global warming (15).

虽然他不是一个科学家，他却拿掉了冰川退缩的证据，取而代之各种短语，暗示在全球变暖问题上尚存在严重的科学质疑(15)。

Mr Prikhodko summarises Russia's dilemma: "we know this is a very serious window of opportunity and nobody should be in any doubt that we want to use it," he says.

普里霍季科总结说俄罗斯面临两难的境地：“我们知道此次峰会是一个非常难得的机遇之窗，无人应去质疑我们想要抓住机遇。”

More serious still is a new mood of self-doubt.

更加严峻的是新生的一种自我怀疑的情绪。

It is without doubt that the cartoon aims at addressing a serious problem prevailing in today's society, that is, the lack honesty in the field of business.

毫无疑问这幅漫画意在指出当今社会一个普遍且严重的社会问题，即商界缺乏诚信原则。

From the very first bleak words of the report - "the situation in Iraq is grave and deteriorating" -the world was left in no doubt that this is a deadly serious exercise.

从这份报告的头一句话冰冷的话语——伊拉克现在的形势是日益恶化，千疮百孔——就可以看出全球都认为伊拉克战争局势严重，前途未卜。

No one should be in any doubt that the consequences are serious for those who carry knives.

任何人都不应该怀疑对于携带刀具的更加严厉。

Rose:Are you serious?I doubt you're a good enough skier to do those kinds of tricks.

萝丝：你是认真的吗？我怀疑你的滑雪技术好到能做出那几种特技。

No doubt of it; it is nothing serious; he is nervous, his spirits must be kept up. Come, set to work.

毫无疑问。伤势并不严重，就是神经紧张，得使他打起精神来。来，动手吧。

There is no doubt that nearsightedness is a serious problem among the youth of our country.

毫无疑问，近视在我国的年轻人中是一个严重的问题。

There is no doubt that environment is one of the most serious problems in the world.

毫无疑问，环境是当今世界上最严重的问题之一。

In classical literature research, there exists serious marginalized anxiety, doubt on value and confusion about subjects.

古典文学研究领域存在着严重的边缘化焦虑、价值怀疑、学科困惑，其核心乃是现实关怀的缺失。

The hotels of all over the world wash countless towels everyday, no doubt that our water resource suffer such serious pollution.

全世界的酒店每天洗涤无数的毛巾，可想我们的水资源受到多严重的污染。