他因为紧张而口吃。
tā yīnwèi jǐnzhāng ér kǒuchī 。
He stutters because he is nervous.
学习语言时，许多人会口吃。
xuéxí yǔyán shí ， xǔduō rén huì kǒuchī 。
Many people stutter when learning a language.
医生建议他参加治疗口吃的课程。
yīshēng jiànyì tā cānjiā zhìliáo kǒuchī de kèchéng 。
The doctor suggested that he take a course to treat his stuttering.