With only one observation per country, it is impossible to control for unobserved heterogeneity across countries.
由于每个国家只有一个观测结果，因此不可能控制各国间未观察到的异质性。
Only the brave sell at auction, for it is impossible to control who buys or what price they will pay.
只有胆大的人才敢在拍卖行交易，因为在交易会上几乎是无法控制谁会去购买，或是他们要付多少钱。
Once a tree felling permit is obtained, it will be next to impossible to control how much timber will be cut, he said.
一旦得到树木砍伐允许，再想要控制树木的砍伐量就是不可能的了，他告诉我们。
One of the difficulties of such research is that it isn't really an experiment- it is impossible to control for all of the confounding variables.
这种研究的困难之一是它不全是一项实验它不可能控制各种混杂变量。
For example, a highly exothermic reaction might be well controlled in a small stainless steel vessel, but could prove impossible to control in a larger glass-lined vessel.
例如，一个高放热的反应可能在一个小的不锈钢反应釜内能够很好的被控制，但是在一个大的塘玻璃反应釜内证明是不可能控制的。
The ecology of the region also permitted armed predators to prowl the surrounding barrens, which were almost impossible for a state to control.
该地区的生态环境使得武装侵略者在周围的荒漠中潜行，国家几乎难以控制这些荒漠。
But you have no control over what MAC addresses will be in the devices you purchase, and you normally can't alter them, so it's impossible to organize anything by MAC address.
但当你买到一块网卡时却无法控制其MAC地址的值，而且通常你还不能修改它，这就会由它引出一些事情。
Expect makes all sorts of automations practical that otherwise seem impossible: scripting of password entry, logging in a remote user's session and returning control to him or her, and much more.
Expect可以完成所有看起来无法实现自动化的工作：在脚本中使用密码条目、登录到远程用户的会话和返回对他或者她的控制，以及更多的工作。
Since it's virtually impossible to eradicate them, it's vital for the country to seek ways to bring the alien species under control.
由于事实上不可能将这些外来物种彻底根除，因此重要的是南非应寻找控制它们滋生的办法。
Honestly, it's impossible to tell without access the the original fund documents that better elucidate issues of economic interest and control.
坦白讲，如果没有能更好说明经济利益和控制权问题的原始基金文件，很难断论。
But whatever the approach, without a point person to take control, effectively dealing with social media becomes nearly impossible.
但不管是何种方法，没有专门的人员来负责，要高效地处理社会化媒体关系几乎是不可能的。
Not only can we not depend on the market to do anything for us, but it is extremely difficult, if not impossible, to manipulate or control anything that the market does.
我们不但不能指望市场为我们做什么，而且也不能控制市场，或者说很难控制市场。
Without the use of a control group it would be impossible to know what percentage of people report benefits due to receiving the drug rather than benefits due to a placebo effect.
如果不进行实验对照，很难知道人们声称的吃药的疗效比不吃药的安慰剂效应的疗效多百分之多少。
Just as he could not control his chancellor (he was, for instance, totally “boxed in” by Mr Brown on sterling and the euro), he found it next to impossible to stand up to George Bush.
就像他控制不了他的司法官一样（他说道，比如他在英国货币和欧元的问题上彻底妥协于布朗先生），布莱尔觉得对抗乔治·布什几乎是不可能的。
Nevertheless, God filled his heart with trust so that at Christ's command, he tried to do the impossible - to move muscles he could not feel or control.
尽管如此，上帝让信充满他的心，以至于基督发出命令时，他试着去做看似不可能的事——移动他无法感知和控制的肌肉。
It is near impossible if multiple companies control separate pieces of the puzzle, and all of them must quickly act in concert to repair the damage from a leak.
而多家公司要控制一个麻烦的很多个互不相干的部分，并且全都要迅速行动去修复泄露带来的损害，这几乎是不可能的。
It is impossible to gather detailed ownership information, since control of most Russian companies is hidden behind obscure corporate structures, often through offshore trusts.
要收集到具体的所有权信息是不可能的，因为多数俄罗斯公司的控制权都掩藏在模糊的公司架构之下，而且通常由海外信托机构控制。
In Europe, the signs of imminent collapse of financial control are also becoming impossible to hide.
在欧洲，债务失去控制，金融濒临崩溃的迹象也越来越难以隐藏。
Fabric and flame seem impossible to exist in harmony, but here, with fine control of flame by appropriate speed and interval, the quality of the fabric is greatly improved.
面料与火，两个在印象中仿佛永远不能和谐接触的事物，却在这通过速度和距离的精细控制，演绎品质升华的过程。
Unless we repulse the enemy's attacks and defeat him, even places held by the guerrillas will come under enemy control, and then it will be impossible to establish base areas.
就是游击战争控制的地方，如果不粉碎敌人的进攻，不战胜敌人，自己控制的地方就要变成敌人控制的地方，也无从建立根据地。
It unfolds in strange and terrifying and sometimes wonderful ways, but trying to control life is almost impossible - that's not to say that you can't control how you react to the stuff that happens.
生活以陌生、可怕或精彩的方式呈现出来，而企图控制生活几乎是不可能的——当然，这不是说你无力控制自己应对变故的方式。
In the future it will be impossible for bars to smash together because the automatic control fixed in them will make speeding bars miss each other.
未来的汽车不可能撞毁，因为车里安装的自动控制器可使快速行驶的汽车保持间距，互不碰撞。
Without thorough planning, program control, and design reviews, these tasks are virtually impossible to accomplish without errors or leaving important aspects undone.
如果没有全面的计划、程序控制和设计评审，那么能够在不犯错或者重要的方面没有遗漏的情况下完成这些任务几乎是不可能的。
Is your video and music file collection growing out of control, making it impossible to find anything?
是您的视频和音乐档案的收集越来越失去控制，使得它不可能找到什么呢？
Nothing can stand still, and although the dark Ones would like to keep you in their control forever that is impossible.
没有什么会停滞不前，并且即使是这些黑暗势力希望把你们永久的控制都是不可能的。
By using some transfer formulae, we may figure out the control point which is impossible for the surveyors to survey directly in engineering survey.
在工程测量中，可以用转换公式计算测量人员无法直接施测的控制点。
The achievement of an equivalent level of control if works were to be carried out at height is considered to be near impossible.
如果工作被带到最高点是考虑过几乎不可能的时候，就可以把成功控制在同等水平。
As a result, it is more difficult (not impossible, just difficult) for an attacker to take advantage of vulnerable network services to take control of your computer.
结果，一个攻击者利用易受伤害网络服务控制你的计算机是更困难的(不是不可能，正直的困难)。
As a result, it is more difficult (not impossible, just difficult) for an attacker to take advantage of vulnerable network services to take control of your computer.
结果，一个攻击者利用易受伤害网络服务控制你的计算机是更困难的(不是不可能，正直的困难)。
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