2. The language learning system according to claim 1 , wherein the feature extraction module performs a phonetic segmentation operation on a plurality of training sentences to obtain a plurality of pronunciation units of the training sentences, and the feature extraction module obtains the training data from the pronunciation units of the training sentences, wherein the feature extraction module performs the phonetic segmentation operation on the learning sentence to obtain one or more pronunciation units of the learning sentence.
2. The language learning system according to claim 1 , wherein the feature extraction module performs a phonetic segmentation operation on a plurality of training sentences to obtain a plurality of pronunciation units of the training sentences, and the feature extraction module obtains the training data from the pronunciation units of the training sentences, wherein the feature extraction module performs the phonetic segmentation operation on the learning sentence to obtain one or more pronunciation units of the learning sentence. 7. The language learning system according to claim 2 , wherein the feature extraction module extracts at least one fundamental frequency contour, at least one energy contour, at least one MFCC, and at least one duration corresponding to the pronunciation and serves at least one of the fundamental frequency contour, the energy contour, the MFCC, and the duration as the pronunciation feature of the pronunciation, wherein the feature extraction module extracts at least one fundamental frequency contour, at least one energy contour, at least one MFCC, and at least one duration corresponding to each of the training data and serves at least one of the fundamental frequency contour, the energy contour, the MFCC, and the duration as the pronunciation feature of the training data.