Because a good language environment is required for language learning, such as if you reside in a country where Chinese is spoken, learning a new language might be challenging. For instance, Singapore has the biggest concentration of Chinese speakers, so if you want to live there, you'll need to be fluent in both Chinese and English. If you attempt to learn Chinese in a non-Chinese environment, you will undoubtedly encounter several challenges. But after a period of intermittent learning, if you can grasp the language or the fundamental vocabulary, you will be able to communicate well but you will be unable to continue your language studies...