How to pronounce 彎曲 in Cantonese (3 out of 8):

背部唔好彎曲 一定要keep住成一直線
Your back should be straight, and you should keep it straight.

Cantonese Sentence Breakdown

背部 bui3 bou6
back
唔好 m4 hou2
(phrase) don't.
彎曲 waan1 kau3
bend
一定要 yat1 ding6 jiu3
must
seng4
to succeed
to finish
to complete
to accomplish
to become
to turn into
to be all right
OK!
one tenth
success
to amount to
whole
full
almost
nearly
capable
a surname
to settle
一直 yat1 zik6
always
sin3
thread
string
wire
line M: 条tiáo [条]
股gǔ [股]
根gēn [根] ]
boundary
traffic route
political path
clue
an undercover agent
a ray of (hope), a quantifier
a territory
an area
the lower ranks
followers in a triad gang