How to pronounce 垂直線 in Cantonese (4 out of 5):

其實個道理同啱啱嘅垂直線係一模一樣嘅。
The logic is the same as the right vertical line.

Cantonese Sentence Breakdown

其實 kei4 sat6
actually
go3
individual
this
that
size
classifier for people or objects in general or an action
indicates approximation when placed before numbers and after a verb
adds emphasis when added before a complement used with a verb
size
height
one
possessive particle
ten thousand dollars
bucks
道理 dou6 lei5
reason
tung4
and
啱啱 ngaam1 ngaam1
(adverb) just right; just now
koi3
indignant
generous
to sigh (with emotion)
垂直線 seoi4 zik6 sin3
vertical line
hai6
(Cantonese) to be
to connect
to relate to
to tie up
to bind
to be (literary)
to involve
relation
relationship
consequence
yes
indeed
right
一模一樣 jat1 mou4 jat1 joeng6
identical