How to pronounce 白老鼠 in Cantonese (4 out of 8):

白老鼠視覺較差
White mice have poor vision.

Cantonese Sentence Breakdown

白老鼠 baak6 lou5 syu2
a guinea pig, a person or thing used as a subject for experiment [written and colloquial]
視覺 sai3 gok3
visual
較差 gaau3 caa1
poorer