How to pronounce 難題 in Cantonese (4 out of 7):

佢哋學到新嘢時, 或者解開難題時會好開心
They're happy when they learn something new or solve problems.

Cantonese Sentence Breakdown

佢哋 keoi5 dei6
(pronoun) they
hok6
to learn
to study
to imitate
science
–ology
a branch of study
school
college
course of education
learning
knowledge
to learn and become
similar to
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
新嘢 san1 je5
new things
si4
o'clock
time
when
hour
season
period
era
current
timely
often
continously
frequently
fashionable
opportune
sometimes…sometimes
a surname
或者 waak6 ze2
or
解開 gaai2 hoi1
untie
難題 naan4 tai4
difficult problem
wui6
a moment (Taiwan pr. for this sense is [huǐ])
metropolitan
gatherings union
to meet
to catch up
hou3
to like
to love
to be fond of
to be liable to
to be likely to
開心 hoi1 sam1
happy