She explains that the concept is similar in principle to the Denver boot, a type of wheel clamp used by some police departments to immobilize illegally parked vehicles.

• 。她解释道，这个想法类似于“丹佛夹板”的原理。“丹佛夹板”是一种夹子，有些警察部门用它来夹固住非法的泊车。