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You own any object you create by allocating memory for it or copying it.
Related methods: alloc, allocWithZone:, copy, copyWithZone:, mutableCopy, mutableCopyWithZone:
If you are not the creator of an object, but want to ensure it stays in memory for you to use, you can express an ownership interest in it.
Related method: retain
If you own an object, either by creating it or expressing an ownership interest, you are responsible for releasing it when you no longer need it.
Related methods: release, autorelease
Conversely, if you are not the creator of an object and have not expressed an ownership interest, you must not release it.
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    Thingamajig *thingamajig = [[Thingamajig alloc] init];
    NSArray *sprockets = [thingamajig sprockets];
    [thingamajig release];
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ÄÇôsprockets ÎªÊ²Ã´²»ÐèÒªreleaseÄØ¡£
Ê×ÏÈÎÒÃDz»ÊÇ sprockets µÄ creater.£¨µÚÒ»Ìõ¹æÔò£©,ÎÒÃÇҲûÓÐexpressing an ownership interest£¬ÒòΪÎÒÃÇûÓÐ
retainËü£¬£¨µÚ¶þÌõ¹æÔò£© ËùÒÔÎÒÃDz»¸ºÔðreleaseËü¡£
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    (NSArray *)sprockets { 
       NSArray *array;
       array = [[NSArray alloc] initWithObjects:mainSprocket,auxiliarySprocket, nil];
       return [array autorelease];
}
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