[bō luó]

Ps: When spelling pinyin, you often have to pay attention to the following issues.

1) Pre-nasal and post-nasal sounds should not be confused. For example, in and ing, en and eng, etc.

2) Flat consonants and retroflex consonants must not be confused. For example, zi and chi, si and shi.

3) Tone symbols must not be mislabeled. For example, the fourth tone of hui is wrongly labeled with the letter u, but it is actually labeled with the letter i.

4) dealing with "one not seven eight" and other variations of the word labeling according to the original tone, read when the tone to be changed. For example, must, "a" was originally a sound, but to be read as a second sound.