At first the girl didn´t understand Chinese, but then she starts trusting the boy and listens with her heart... so she can even speak some Chinese an the end.
bǎ shǒu gěi wǒ : to give me your hand yí jù yě tīng bù dǒng : can´t understand one sentence
yòng xīn : with heart nǐ shuō shén me : What did you say?
This video (see at YouTube) is of advanced level difficulty. It has subtitles in Chinese characters.