The problem is difficult because BPA is used for most types of plastic foil in which you wrap food. Thus, a direct contact with the body is established and it occurs on a daily basis.
更困难的是，BPA是最常用在保鲜膜中的原料，人们每天都不可避免的会有直接接触。
No matter how difficult the problem is, think about it by yourself first.
不管问题有多难，首先要自己思考。
Comparing the intelligence of animals of different species is difficult although there are certain tests and problem sets that have proved to be useful.
比较不同种类的动物之间的智商是一件很困难的事情，虽然有某些测试和问题设置已经证明了很有用。
No matter how difficult the problem, synchronizing and managing the diverse data sources is a key requirement to keep your business competitive.
不管这个问题有多么困难，同步和管理不同数据源仍是使企业保持竞争力的关键需求。
Others have built such a dream device, but none has yet overcome the problem of input: typing on a screen is difficult and handwriting recognition has never really worked.
其他厂家也曾经尝试推出这种梦幻设备，但是他们都没能克服一个问题：屏幕输入很困难，而手写识别率低的可怜。
This boom brings a problem: it is helping to drive up the Canadian dollar, which risks making life more difficult for manufacturers back east.
这种强烈需求带来一个问题：对加拿大元的升值起了推波助澜的作用，使得东部的厂商生存更加艰难。
A much more difficult problem for the retailer is to assure that replenishments for the back room are delivered in time.
但是，零售商还有一个更难解决的问题：如何确保补充的产品及时交付到仓库？
We are now at the point where the dimensionality and size of the data is a big problem. It makes things computationally very difficult to find these patterns we want to find.
他补充道，“在这里，数据的维数和容量是个大问题，要依靠计算来找到我们想要找寻的模式会变得极为困难。”
The fact that this is a monetary union of 17 countries makes decision making difficult, which complicates the problem.
这是一个17个国家的货币联盟，很难做决定，使问题更加复杂。
The difficult problem that still awaits an answer is how to get higher yields from food crops without a commensurate rise in the loss of water through evapotranspiration.
困难的问题是，仍在等待怎样获得与蒸散而损失的水相对应的食用作物产出。
Every problem is a character-building opportunity, and the more difficult it is, the greater the potential for building spiritual muscle and moral fiber.
每个难题都是造就品格的机会，难度愈高，就愈有潜力建立强壮的灵命和道德思想。
The problem is that strangers are difficult to convert. And the other problem is that they're expensive to reach.
但问题是陌生人难以转变成产品的宣传者，想利用他们的好口碑要付出昂贵的价钱，还有最困难的是，常常要满足他们的需求。
And this proves to be surprisingly difficult to tell Part of the problem is if you ask people who go into therapy "Did you get better after therapy?"
出乎人意料的是，这个问题非常难回答,原因之一是，如果你问接受过治疗的人,“你们治疗完以后，好起来了吗？
Obviously this is a difficult problem, but the incentive to solve it is very big. The main approaches fall into the following categories.
显然，这是一个很困难的问题，但是解决它的激励也很大。
The only problem is that it can be extremely difficult to achieve such a following, which is where we come in.
唯一的问题是，拥有这么多追随者是一件很难的事，而这也正是我们的切入点。
The biggest problem with them is that it's a standardized interface. It would be difficult to have your new system call added to the kernel, so any additions are likely served through other means.
使用这种方法的最大问题就是它是一个标准接口，很难将新的系统调用增加到内核中，因此可以通过其他方法来实现类似服务。
The problem is, the more code that is created in this way, the more unmanageable it becomes, and the more difficult it becomes to develop in an unobtrusive manner.
问题是，以这种方法创建的代码越多，代码将越来越难以管理，要以一种低调的方式进行开发将变得越来越困难。
As part of their conversations with Afghan women, the Marines are to ask basic questions, including what is the most difficult problem facing the village.
作为与阿富汗妇女的谈话的一部分，女海军陆战队员问的基本问题，包括村里面临的最困难的问题是什么。
Without adequate data on the nature and extent of the problem it is difficult to formulate a policy to foster a culture of integrity that limits and discourages deviant behaviour.
由于没有充分的数据资料来证实这种问题的本质和严重程度，因此就很难制定一种策略来树立学术诚信、限制和阻止不轨行为。
We recommend that you run with tracing disabled in this mode, as this typically requires the user to reproduce the problem, which is difficult if it is not in interactive mode.
我们建议在此模式下禁用跟踪，因为这通常需要用户复制问题，如果没有在交互模式下这是很困难的。
The problem with that approach is that it leaves the most difficult tasks to the end of the day.
这种方式的问题是，我们把最困难的任务留在了一天之中的最后时刻。
An important example of the lemons problem is the inventor who creates an idea that is difficult or impossible to patent.
“柠檬”问题的另一个重要案例是那些发明了很难甚至不可能寻求专利保护的发明者的困境。
In most low-income countries, especially in Africa, the magnitude of the problem is unknown, as this form of TB is so difficult to diagnose.
在大多数低收入国家，特别是在非洲，由于这种形式的结核病难以诊断，问题的严重程度尚不得而知。
The problem is that within the femoral nerve all the fascicles are themselves bundled together, making it difficult to stimulate them individually.
问题是在股骨神经内所有的神经束是捆绑在一起的，很难去单独刺激它们。
During the development of such a system, a communication problem may arise that is difficult to investigate by instrumenting or debugging your software.
在开发这类系统的过程中，一个通信问题可能会使得评估或者调试软件变得困难。
Sir Michael might have handled a difficult brief more deftly. But his departure is nonetheless a problem for the BBC.
迈克尔爵士也许更灵活地处理了这个困境，尽管如此他的离去对BBC还是出了一道难题。
In practice the problem is that producing such "cellulosic" ethanol is much more difficult and expensive than producing it from other crops.
当然实践中提炼这种纤维乙醇比起用其它谷物原料要困难和昂贵得多。
In practice the problem is that producing such "cellulosic" ethanol is much more difficult and expensive than producing it from other crops.
当然实践中提炼这种纤维乙醇比起用其它谷物原料要困难和昂贵得多。
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