Possibly Taiwanese children have an accent problem they must overcome.
Taiwanese teachers and students of English care about standard (American) English pronunciation. Generally speaking, Taiwanese have an English accent more similar to that of general American English speakers than Singaporeans, Indians and Japanese.
I taught English pronunciation and grammar at high school five years before I switched to law at college. I graduated from college in Taipei, and spent several years studying in Texas, California, New York, and Scotland.
*Oxford Eng. Dict.:
Accent: A distinctive way of pronouncing a language, especially one associated with a particular country, area, or social class
Pronunciation: The way in which a word is pronounced