How to pronounce 便利 in Cantonese (8 out of 9):

關鍵在於邊個可以更加快、更加便利嘅方式
The key is who can do it faster and more conveniently.

Cantonese Sentence Breakdown

關鍵 goan1 hing3
key
在於 depends on
lies in
邊個 bin1 go3
(pronoun) who
可以 ho2 ji5
(adjective) so so
更加 gang3 ga1
even more
faai3
fast
便利 bin6 lei6
convenience
koi3
indignant
generous
to sigh (with emotion)
方式 fong1 sik1
method