1. "Too young and too innocent" is the English translation of the phrase "太年轻，太单纯".

2. To explain this expression, we need to understand the meanings of "young" and "innocent". Young refers to being of a lesser age with relatively less experience, while innocent describes a lack of complexity and worldliness in one's thoughts, making them easily trusting and possibly having a simpler understanding of things.

3. In English, "Too young" is often used to express a lack of maturity or wisdom required for certain tasks due to age or inexperience. For instance, a young person might make mistakes at work because of their lack of experience or not understand certain complex social norms due to their age.

4. "Too innocent", on the other hand, emphasizes the simplicity in someone's thoughts, which may lead them to trust others too easily or lack an understanding of the world's complexities. This innocence can sometimes make them vulnerable to deception or harm because they may not recognize others' true intentions or motivations.

5. Combining these two phrases, "太年轻，太单纯" conveys a criticism or concern about someone's age, inexperience, and mental simplicity. This expression is often used to remind or warn someone to be more mature and worldly-wise to cope with life's challenges and difficulties.

6. It is important to note that this expression can sometimes carry a negative connotation, implying a lack of necessary wisdom and experience. Therefore, caution should be exercised when using it to avoid hurting someone's feelings or self-esteem.

7. At the same time, we should recognize that being young and innocent does not necessarily imply weaknesses; they can also represent potential, enthusiasm, and the possibility of growth. Therefore, when assessing others, we should aim to view their strengths and weaknesses comprehensively and fairly.