xué xí / pǔ tōng huà / shí / xiān / bǎ / měi ge / yīn jié / de / shēng mǔ / hé / yùn mǔ / fēn qīng chu学习普通话时,先把每个音节的声母和韵母分清楚。When learning Mandarin, first distinguish the initial and final of each syllable clearly.