[属于 (BELONG TO)](%E5%B1%9E%E4%BA%8EBELONGTO.md) [一对一 (Has One)](%E4%B8%80%E5%AF%B9%E4%B8%80%E5%85%B3%E8%81%94.md) [一对多 (Has Many)](%E4%B8%80%E5%AF%B9%E5%A4%9A%E5%85%B3%E8%81%94.md) [多对多 (Many to Many)](%E5%A4%9A%E5%AF%B9%E5%A4%9AManytoMany.md) [预加载 (Preloading)](%E9%A2%84%E5%8A%A0%E8%BD%BDPreloading.md)