Here are some factors to consider when deciding whether to learn Chinese only or both Chinese and English:
* Your language goals: What do you want to achieve with your language learning? If you want to be able to communicate with Chinese people in China, then you will need to learn Chinese. If you want to be able to read Chinese literature or conduct research in Chinese, then you will also need to learn Chinese.
* Your career goals: What do you want to do with your career? If you want to work in a field that requires Chinese proficiency, then you will need to learn Chinese.
* Your learning style: How do you best learn languages? If you learn best by immersion, then you may want to consider studying in China. If you learn best in a structured environment, then you may want to consider taking Chinese classes at a university.
Ultimately, the decision of whether to learn Chinese only or both Chinese and English is a personal one. There are many factors to consider, and the best decision for you will depend on your individual circumstances.