0 used to refer to something that exists now -- 存在的；现存的
The existing laws covering libel in this country are thought by many to be inadequate. 很多人认为，这个国家现行的有关诽谤罪的法律很不完善。
Under the existing conditions many children are going hungry. 在目前情况下，会有很多儿童忍饥挨饿。
The results of the new research would seem to conflict with existing theories.
The government wants to toughen up the existing drug laws.
Any new video system that is incompatible with existing ones has little chance of success.
