How to pronounce 擴散 in Cantonese (7 out of 8):

就係由手指邊開始, 然後擴散到第三手指
It starts at the fingertips and then it spreads to the third finger.

Cantonese Sentence Breakdown

就係 zau6 hai6
it is; exactly
jau4
to follow
from
it is for...to
reason
cause
because of
due to
to
to leave it (to sb)
by (introduces passive verb)
up to
through
a surname
手指 sau2 zi2
(slang) (of computer garget) USB flash drive
bin1
side
edge
margin
border
boundary M: 个gè [个]
simultaneously
verge
hem
limits
bounds
nearby
near to
a surname
which
where
what
開始 hoi1 ci2
begin
然後 jin4 hau6
then
擴散 kwong3 saan3
spread
dou3
to (a place)
until (a time)
up to
to go
to arrive
(verb complement denoting completion or result of an action)
been to
a particle used after a verb or adjective to indicate degree
extent
第三 dai6 saam1
the third