Have you ever had a small question in your heart when taking the high-speed trainWhy do the seat labels on the carriage have A, B, C, D, F, but skip E?Do you think this design is like an unsolvable mystery hanging in your mind?Not afraid, today we will unveil this small mystery of high-speed rail together!When we sit on high-speed rail seats, we may rarely realize the design philosophy behind each seat.So, what is hidden behind this?Seat design, seemingly simple on the surface, is actually a complex project...