In grade school English class, our teacher raised as examples "cough", "rough", "through", "though", etc.(i.e., all the "ough" words). She pointed out that sometimes words are inconsistent with phonics.
I became annoyed and complained about the inconsistency. Her response (to me and the class) was straightforward: phonics wasn't exact and some parts of speaking and reading must be memorized. But she also pointed out that everybody else had learned it as a child and that we would too, which was a pretty convincing argument. Within a few days the desire for a foolish consistency evaporated as we advanced through our reading assignments, slaughtering armies of text before us.
English words are composed of characters from a phonetic alphabetic. In Chinese each word is a unique character. So there is no phonics system for Chinese.