lǎo / shī / xiàng / wǒ / men / jiè / shào / le / tōng / yòng / pīn / yīn / hé / hàn / yǔ / pīn / yīn / de / qū / bié

老师向我们介绍了通用拼音和汉语拼音的区别。

The teacher explained the differences between Tongyong Pinyin and Hanyu Pinyin.