I'm sorry, but I need more context to answer your question properly. The phrase "the two long structures indicated by d are" is incomplete and doesn't provide enough information for me to write a comprehensive and relevant article. To give you a useful and informative response, please provide more details, such as:
- What is the subject matter? (e.g., anatomy, architecture, genetics, computer science, etc.)
- What does "d" refer to? Is it a label on a diagram, a variable in an equation, or something else?
- What kind of "long structures" are you asking about? Are they physical structures, conceptual structures, or something else entirely?
- What is the context in which you encountered this phrase? (e.g., a textbook, a research paper, a conversation, etc.)
Once I have this information, I can write a detailed and informative article that meets your needs.
To give you an idea, if you were asking about human anatomy and "d" referred to a diagram of the human leg, the "two long structures" might be the tibia and fibula. I could then write an article about their anatomy, function, common injuries, and related topics Easy to understand, harder to ignore..
Without more context, I can only provide a very general and potentially irrelevant response. Please provide more details so I can assist you better.