xué / xí / běi / jīng / huà / shí / xué / shēng / xū / yào / liàn / xí / ér / huà / yùn / de / zì / rán / fā / yīn学习北京话时,学生需要练习儿化韵的自然发音。When learning Beijing speech, students need to practice the natural pronunciation of rhotacized finals.