Pinyin β€” Quiz β€” Day 3: First Initials: b p m f, and d t n l

1 What distinguishes "b" from "p" in Mandarin?
2 Which Thai/English sound is Mandarin "b" closest to?
3 Listen and choose the correct meaning 爬
4 How can you self-test whether you're aspirating correctly?
5 '弟弟' means?