How to pronounce 洞天 in Cantonese (1 out of 2):

勾漏洞被稱為道教「第二十二洞天
The loophole is called the "Twenty-second Hole Day" of the Gospel.

Cantonese Sentence Breakdown

勾漏 kau1 lau1
skim through
tung4
boundless
pei5
quilt
blanket
(literary) to cover
can3
to fit
to match
to suit
to go with
fit
suitable
symmetrical
wai6
because of
for
on account of
on behalf of
by (in the passive voice)
道教 dou6 gaau3
Daoism
第二 dai6 ji6
second
十二 sap6 ji6
twelve
洞天 dung6 tin1
grotto heaven