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。
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。”
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。
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)。
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。
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毫无疑问，近视在我国的年轻人中是一个严重的问题。 严重的问题。
And in that I'm giving Dan Smith the serious benefit of the doubt because his tackle was by far the worst, well late and I think a bit nasty.
这个认定给了史密斯最大的好处，因为他的犯规时最恶性的，后来想起来真的觉得很恶毒。
There is no doubt that nearsightedness is a serious problem among the youth in our country.
例毫无疑问，近视在我国的年青人中是一个严重的问题。
There is no doubt that nearsightedness is a serious problem feelong the youth of our country.
毫无疑问地?远视在我国的年老人中是一个严重的题目。
There is no doubt that nearsightedness is a serious problem among the youth in our country.
【例】毫无疑问，近视在我国的年青人中是一个严重的问题。
He is your superior, no doubt, and there do seem objections and obstacles of a very serious nature;
毫无疑问，他条件比你好，看来确实会有人竭力反对，加以阻挠。
There is no doubt that the ecological crisis has not only a personal crisis, a national or regional crisis, but also a global crisis, as a serious disaster.
毋庸置疑，生态危机作为一个日益严峻的灾难，已经不只是个人的危机，也不只是某个国家或地区的危机，而是全球性的危机。
There is no doubt that the ecological crisis has not only a personal crisis, a national or regional crisis, but also a global crisis, as a serious disaster.
毋庸置疑，生态危机作为一个日益严峻的灾难，已经不只是个人的危机，也不只是某个国家或地区的危机，而是全球性的危机。
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