封鎖線

To seal; to close up; to confer a title or rank; a surname; classifier for sealed items, especially letters or packages.

A metal device with a key or combination to fasten doors, chests, etc.; a chain; to fasten with a lock; to confine; to cover; to frown.

Thread; string; wire; line; a thin, flexible object; a route or path; a boundary or limit; a clue.