How to pronounce 改革開放 in Cantonese (4 out of 5):

就話會改革開放
It's reform and opening up.

Cantonese Sentence Breakdown

就話 zau6 waa6
say; can be reasoned
wui6
a moment (Taiwan pr. for this sense is [huǐ])
metropolitan
gatherings union
to meet
to catch up
改革開放 goi2 gaak3 hoi1 fong3
reform and opening up