It's hard to uproot deeply held beliefs about cancer screening with scientific data.
很难用科学数据来根除人们对癌症筛查根深蒂固的观念。
Scientists say the compound is likely to cause cancer but have no hard scientific proof.
科学家们称这种化合物可能致癌，但是并没有确凿的科学依据。
But there is no hard evidence proving that low dose radiation, below 100 millisieverts, is likely to cause cancer.
但没有确实的证据证明少量辐射，低于100毫西韦特，会导致癌症。
People don't know there is an epidemic of cancer of the oesophagus, for example, which is very hard to treat.
比如，人们还不知道现在正流行食管癌，而这一病症是非常难以治疗的。
This is not a new suggestion, but brain cancer is rare, and its rarity makes it hard to study systematically.
这个提议并不新鲜，但脑癌是罕见的，这使做系统研究变得很难。
Not only is aspirin so cheap it will not make any money for drug firms, it could be hard to find a group of women with breast cancer who were prepared never to take aspirin during a trial.
这不仅是因为阿司匹林的价格低廉，药物公司很难从它身上赚到钱，而且可能很难找到一群患有乳腺癌又愿意在试验期间准备从不服用阿司匹林的妇女。
And if he doubted that, he had only to note that in his own hard-smoking family a grandfather, an uncle and an aunt had all died of lung cancer.
最算他还会怀疑抽烟有害健康，他也该注意到一件事实，就是自己重度瘾君子的家族里，祖父、叔叔和阿姨共三位皆死于肺癌。
So hard that almost half of patients that undergo surgery for lung cancer continue to smoke.
美国食品和药物管理局），也使几乎一半已经因肺癌做过手术的病人仍继续吸烟。
The immune system has a hard time recognizing and fighting cancer because the enemy is not an invading germ but our own cells gone rogue.
由于癌细胞本身不是外部侵入的病菌，而是人体自身的问题细胞，因此免疫系统很难对癌细胞识别和清除。
Patterns are hard to spot because even when researchers use a large sample size, only a much smaller number of people will get cancer.
即便是选取更多的试样人群，这种局面也很难说清，因为毕竟只有很少部分的人会患上癌症。
Last year, the much-delayed Interphone report found no hard evidence that mobile phones increase the risk of cancer, but the issue remains unresolved.
去年，久经耽搁的对讲机报告没有发现确凿的证据表明手机会增加患癌症的风险，但这个问题仍未解决。
But that has been hard to prove. Studies of dietary fiber and colon cancer failed to find that fiber was protective, and studies of vitamins thought to protect against cancer failed to show an effect.
关于膳食纤维与结肠癌关系的研究未能证明纤维素能起到保护作用，对于维生素能防止癌症的研究也以未能有明显的作用效果。
Once the hard decisions have been made about how to treat a patient's cancer, doctors face an even trickier question: how do you help patients deal with the side effects of treatment?
医生一旦艰难地为癌症患者确定了治疗方案，就会面对一个棘手的问题：如何帮助患者解决治疗产生的副作用？
With hazards everywhere, plus the complications of genetic predisposition and age, it is hard for comeone to work out his actual risk of developing either cancer or metabolic syndrome.
由于致病的因素相当常见，再加上基因上免疫缺陷和年龄这类因素的复杂性，确定患上无论是癌症还是代谢综合病症的实际风险就非常困难。
When talking about cancer risk, it's important to focus on things we have hard evidence for.
谈到癌症危害，重点应该集中在我们已经证实的因素上。
So many rumors and controversies surround breast cancer-what really causes it, what really prevents it-that it can be hard to know whom to believe.
关于乳腺癌的病因及预防，一直有很多的误区和争议，我们很难判断哪些是可信的。
For Brian Lenihan, who died of cancer on June 10th, it was impossibly hard.
在6月10日死于癌症的布赖恩·勒尼汉来说，这是白费功夫。
Cancer is hard - it is not one disease or, if it is, no one has figured out the weak link in cancer cells that would lead to a cure.
癌症是个难题—因为它并不单是一种疾病，或者如果是，也没有人能指出癌细胞间存在的某种细微联系进而引出一种治疗方法。
Pancreatic cancer can be hard to diagnose, since the early stages have no visible symptoms.
胰腺癌很难被诊断出来，因为在病症的早期没有明显的症状。
One of the challenges in treating cancer is that cancer cells can spread into hard to find areas of the body, as well as in areas that can't be reached by a surgeon.
治疗癌症其中的一个难题是，癌症细胞扩散到身体中难以发现、通过外科手术又难以实施的区域。
Cancer of the pancreas is often found when it is very advanced and is very hard to treat.
癌症的胰腺，往往发现时，这是非常先进的和是很难处理。
Is cancer just an impossibly hard problem?
癌症真是一个无法解决的难题吗？
Cancer (malignancy), unproven tumour, polypus, hard lump, cyst or excrescence of the large intestine.
癌症(恶性肿瘤)、未经证实为良性或恶性之肿瘤、大肠息肉、硬块、囊肿、赘生物。
Chen has lived a difficult life and was even diagnosed with cancer 40 years ago, but that has never stopped her from working hard to help others.
陈绸的一生十分辛苦，40年前甚至被诊断出罹患癌症，但是这一切都不能阻止她热心帮助别人。
癌症是个严厉的老师。
The kidney cancer rest biggest psychology asked that hard is fears to the death all.
肾癌息者最大的心理问硬就是对死亡的恐俱。
Wood is used widely as raw material, but hard wood dust (e. g. oak and beech) can lead to nose cancer.
木头作为原材料得到广泛应用，但硬木粉尘（如橡木和山毛榉粉尘）可导致人患鼻癌。
Let me take another example, imagine how hard a young man having cancer.
让我再举一个例子，想象一下一个患有癌症的年轻人生活得有多么艰辛。
Let me take another example, imagine how hard a young man having cancer.
让我再举一个例子，想象一下一个患有癌症的年轻人生活得有多么艰辛。
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