1. Beans: Beans are a very good source of protein, and they also contain a lot of calcium. Examples include tofu, black beans, and soybeans.

2. Green leafy vegetables: green leafy vegetables contain a lot of nutrients, including calcium. Examples include spinach, mustard greens, rape, chard, etc.

3. Nuts and seeds: Nuts and seeds are healthy snacks and are rich in nutrients which also contain calcium. Examples include sesame seeds, almonds, walnuts, sunflower seeds, etc.

4. Seafood: Seafood is rich in nutrients, including calcium. Examples include abalone, kelp, seaweed, etc.

5. Seafood: Calcium is also found in aquatic products, and fish is one of the best. For example, fish, shrimp, crab, etc.

6. Orange juice, lotus root, red dates, kiwi fruit and black sesame seeds also belong to calcium-rich foods.

It is worth mentioning that our body needs vitamin D for better calcium absorption, so a proper diet and appropriate outdoor activities are key to maintaining healthy bones in the body.