A garbage collector?的用法和样例：
- When no more storage is available, the system invokes a garbage collector.
- Java has a garbage collector,which looks at all the objects that were created with new and figures out which ones are not being referenced anymore.
- The daemon sets up this shared memory upon initialization and acts as a garbage collector thereafter, helping to ensure that only active processes remain registered.
- One former Pomona student worked as a garbage collector on Long Island for a couple of summers rather than pursuing more-prestigious internships or travel.