Originally Posted by MahlerBrass

If you find yourself playing everything short, stop, and play the same passage completely slurred. Once you're able to play it slurred with a continous flow of air (remember: the air doesn't stop, it's like a water faucet when turned on), then it's just a matter of remembering that the tongue just bounces off of the air to produce an articulation. A good anology would be to picture a water faucet going and passing a butter knife through the running water, does the water ever stop? So must your air be continous at all time and that'll hopefully help you achieve that sound you're looking for, hope that helps!