Remember, you may displease the listener, either because you go too fast to be understood, or too slow to be interesting.

记住，如果你语速太快则难以听懂，语速太慢则拖沓乏味，如此都会使考官厌烦。

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The proposed idea would convert speech to text and back, using the switch to remove any unusual pronunciation or too-quick talking before it reaches the listener's ear.

ENGADGET: Apple seeks patent for hearing aids that deliver speech at an even keel