How to pronounce 芯 in Cantonese (23 out of 24):

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石墨烯雙電池
It's a double-core battery.

Cantonese Sentence Breakdown

石墨 sek6 mak6
graphite
jing1
alkene
soeng1
double
pair
seon3
the tongue of a snake
電池 din6 ci4
battery
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