n空挡是哪个单词

1. What is the full spelling of "N" gear in English?

2. In the context of transportation, what does the term "empty" mean?

3. What is the difference between manual and automatic empty gear?

4. What is the meaning of "empty" in other contexts?

5. What is empty slip and what are the safety precautions?

6. How has the concept of empty slip changed with advancements in technology?