lǎo / shī / shuō / pǔ / tōng / huà / de / dì / yī / shēng / hé / dì / èr / shēng / dōu / shǔ / yú / píng / shēng

老师说，普通话的第一声和第二声都属于平声。

The teacher said that the first and second tones in Mandarin are both level tones.