1. He has an impediment in speech. 
   他讲话口吃。
2. By much pains, the orator overcame a natural impediment in his speech. 
   这位演说家用苦练的方法克服了天生的口吃毛病。
3. It 's difficult to understand him because he has a speech impediment 
   他的话很难听懂,因为他讲话口吃
4. any obstacle or impediment. 
   任何造成困难或迟疑之物。
5. One that hinders; an impediment. 
   妨碍物；障碍物

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• 1. 言语障碍
  impede 阻止...impediment speech 言语障碍...impel 迫使
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