The company mentioned that hosts in China used a separate cleaning program to prevent covid transmission than the uniform five-step cleaning process it implemented in the rest of the world.
请问老师，最后一句的it是什么用法呢？我觉得好奇怪为什么不直接用implemented表被动，就不用it了哇
it implemented in the rest of the world是定语从句，it 指 The company。
