In this passage, we can see a typical scene of a love dispute. The hero is bitten by his beloved girlfriend, which is undoubtedly a very painful experience. However, when faced with the situation, the doctor showed a very calm attitude and accurately diagnosed the problem in 30 seconds.

Well, the first thing we need to know is that when a man is attacked by a woman, his body has a series of reactions to protect itself. One of the most important is the release of chemicals through the blood vessels in the skin. These chemicals can act as a defense and thus reduce the damage.

When a man is bitten, his body may produce a chemical called histamine, which triggers a series of physical reactions. These reactions include skin redness, pain, and swelling. However, the doctor did not appear surprised or shocked by the situation. Instead, he seemed familiar with the phenomenon, which could even be described as "a subcutaneous blood vessel being bitten."

This means that the doctor has some knowledge of the phenomenon, or at least experienced it. In this case, the doctor's ability to make a correct diagnosis quickly shows that he has full confidence in his work. He doesn't need to spend much time thinking about it because he has already had similar experiences.

In addition, the doctor's professional attitude also reflects his seriousness and responsibility for his work. His ability to make accurate judgments in a short period of time shows that he is an experienced doctor who can handle a wide variety of emergencies.

Overall, this text shows us the importance of medical knowledge and the doctor's sense of responsibility. Although this incident may have caused a lot of trouble to the hero, the doctor's professional ability and quick thinking allowed him to solve the problem in a timely manner. This is a good example to remind us to always pay attention to our health in our daily lives, while also respecting the work of medical professionals.