紧张

nervous; tense; keen; anxious; stressful; strained; intense; tight; uptight; jittery; overwrought; tension; stress; strain; nervousness; tightness; urgency; twitter; dither; tizzy; collywobbles; tense up; become nervous; keyed up; on edge; in a state of tension; wound up; in a tizzy

口吃

stutter; stammer; falter; stuttering; stammering; speech impediment