For thousands of years, food has been constantly migrating and changing with the footsteps of people. No matter how far the footsteps are, in human minds, only the taste of hometown is familiar and stubborn. It is like a taste positioning system On one end, a remote place thousands of miles away is locked, and on the other end, the hometown deep in memory is always involved. What does "it" mean? ['Hometown.', 'Footsteps.', 'Food.', 'Taste.']