There are several pronunciations of Pinyin o

There are several pronunciations of Pinyin o

O in pinyin, the first sound is "Wo, Wo", the second sound is "Wo", the second sound is "Wo", the third sound is "I", the fourth sound is "hold, lie"
When O and other letters are put together to form a compound vowel, its pronunciation is different from that of a single vowel

What is the pronunciation of the first word "Du" in Zheng renmai's ancient prose? What is the meaning of the second word?
I'm here. Thank you

Du, the word in front, is used as a verb to calculate and measure. Du, the word in the back, is used as a noun to measure

Zheng renmai's original Pinyin
First of all, I would like to recite a few notes from Du, but I forget to recite a few notes from Du

Thank you for your adoption