Cách sử dụng
The expression "block off" means to block or close an area or passage so that people cannot enter or exit. This can be done by using barriers, fences, or cones to prevent people from passing through the blocked area. For example, a street may be blocked off to allow for construction work to take place safely. Another example could be a store blocking off a section that is under renovation. It's a way to keep people safe and maintain order while work is being done.