This doesn't mean that an unintended style drift can't come into play.
Morne Morkel can drift in and out of games but can extract spiteful bounce at his best, and Rory Kleinvelt has looked steady in his appearances so far.
Farming fish close to shore often causes contamination of water and seabeds, so the company has partnered with fish producers to devise a remotely-controlled fish pen that can drift with currents in the open sea.
Research based largely on data from their homeland has indicated the carp can spawn successfully only under the right circumstances, including temperatures of about 70 degrees and long stretches of continuously flowing water where fertilized eggs can drift while incubating.
Some of Hearst's drift to the right can be attributed to age.
These couples can gradually drift apart, carving out separate lives for themselves.
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The immigration question offers the GOP an opportunity to really demonstrate to the electorate that this is a party capable of change and that the rightward drift of the party can be reversed.
If you want a strong Atlantic partnership, Robert Gates said, the "drift of the last 25 years can't continue".
Another system uses cameras to detect when the car begins to drift, emits a warning and can automatically steer the car back into the lane.
Mr Fast says computerised-video strike zones can vary between stadiums or drift slightly over a season.
What can be done about this accelerating drift into the muck?
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Lucky for them, they can in fact allow the pound to drift lower by monetizing some of their debt.
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It can be used to identify the general drift of policies, such as Margaret Thatcher's effort to restrict government interference with the free market.
Having this knowledge about yourself can help you find your way out of drift, or avoid it altogether.
Large numbers are killed each year on the long-lines or drift nets of commercial fishermen, in which the animals can become snared and drown within 40 minutes.
The cars can be coaxed into a controllable four-wheel drift, pitching around as they corner.
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The weak signal can cause a ship's instruments to gradually drift out of true, without setting off any alarms, leaving the ship in a different position to where it "thinks" it is.
But, from my dealings with black conservatives, I can tell you that -- for many of them -- their rightward drift began as a reaction to the condescension on the left.
You can see from the plot that the pattern is a sudden jump and then a slow drift downward.
Some elements in this crisis can indeed be traced back eventually to defects in Britain's system, notably the drift of power away from Parliament to the executive.
If Mr Blair can conjure up a compelling vision of the future, he may be able to arrest the sense of drift that has afflicted his government over the past year.
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