about model

in cookbook there has something like below。i wonder how to and
where define association between model and it's main model? main
model mean ??

---------------------------------
Associated models are available through the main model. In the
following example, Recipe has an association with the Ingredient
model.

1. <?php
2. class RecipeController extends AppController {
3. function index() {
4. $ingredients = $this->Recipe->Ingredient->find('all');
5. $this->set('ingredients', $ingredients);
6. }
7. }
8. ?>
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