Unlike power plants, which are few in number and so easier to regulate, cars are ubiquitous and much more difficult to control.
They may have certain inclinations which are powerful, and which may be difficult to control.
The costs of providing and managing care, as everyone also knows, can be very difficult to control, and the task of allocating the resources necessary to an effective infrastructure of care is one that the current cartel-like system is not doing very well.
They country is huge, it's an unbelievably big distance between the cities and so it's difficult to control the training.
"Either we allow our population growth to continue indefinitely, with all that this will imply for our public services, our environment and our society, or we take the firm and sometimes difficult measures to bring immigration under control, " he said during a general debate on immigration on 12 December 2011.
BBC: 'Widespread' public concern about immigration - Tory MP
However, even if the airports themselves are trying to reduce their emissions, it is difficult to control all the concessions and sub-contractors that work within big airports.
You need to give up a measure of control, difficult for news veterans reliant on editing hierarchies and advertising executives determined to lock down the message.
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Once such powers of IW are unleashed in a preemptive attack, the ability to control and calibrate forces becomes extremely difficult.
Nothing that will happen over the next ten years can undo the way the past decade's digitization of entertainment--movies, music and books--has made it difficult or impossible to control its dissemination.
Spain goalkeeper Iker Casillas and Brazil custodian Julio Cesar have previously suggested the ball is difficult to control.
And it is a trend that makes even Mr Fox's own party difficult to control.
Spot fixing is particularly difficult to control since players barely see this as corruption at all and almost any player can deliver the fix.
"I am afraid we can't let up on the difficult decisions we have made to cut public spending and to get our deficit under control, " he said.
BBC: David Cameron and Nick Clegg: No let-up in tough decisions
Derbyshire Fire and Rescue said it had been a difficult fire to put out completely but it is under control.
If Syria seized control of a demilitarized Golan, it would be difficult and costly for Israel to move armor up the Heights under fire.
Automobile intelligence already assists the driving experience by warning of dangerous situations and taking control of parking, which is, for some people, the most difficult maneuver to perform.
ENGADGET: Editorial: Self-driving cars FTW, but not for everybody
But the furious debate and challenges faced by gun control advocates in many states are a reminder of just how difficult it is to tighten gun laws, even after the most horrific tragedy.
He also got a peek at the NASA engine shop, shuttle landing facility and control tower, vehicle assembly building, and mobile launch platforms, as well as several other difficult-to-remember locales.
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