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。
Medicare costs are more difficult to control, but not impossible.
Medicare的花销控制起来要难得多，但并非不可能。
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。
Office workers tried to put out the fire, but it was impossible to control it.
办公室的工作人员试图把火扑灭，但是他们控制不了火势。
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。
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。
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。
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。
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