叨咕

yà dāng ná chū jì mǎn le é yǔ dān cí de bǐ jì běn yī biān dú yī biān dī shēng dáo gu zhe shén me

亚当拿出记满了俄语单词的笔记本一边读，一边低声叨咕着什么。

Adam takes out a notebook with written down Russian words, reads through, and whispers something.