The variation of local friction coefficient is similar to velocity and local minimum value occurred in reverse flow area.

摩擦阻力的变化趋势与速度类似，在产生逆向流处出现局部极小值。

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This causes friction with local people.

ECONOMIST: Afghanistan

"The resignation is bound to stir up renewed debate about friction within the Local Organising Committee (LOC), " said BBC Sport's Mohammed Allie in Cape Town.

BBC: Another 2010 official resigns

The accountability of US forces and local militia working with them has been a growing source of friction in Afghan-US relations.

BBC: File image of US soldier in Wardak province, Afghanistan