形容词

1. （尤指与未来相对的）现存的，现行的，目前的
Existing is used to describe something which is now present, available, or in operation, especially when you are contrasting it with something which is planned for the future.

1. having existence or being or actuality

e.g. an attempt to refine the existent machinery to make it more efficient
much of the beluga caviar existing in the world is found in the Soviet Union and Iran

Synonym: existent

2. presently existing

e.g. the existing system

3. existing in something specified

e.g. depletion of the oxygen existing in the bloodstream