{"products": [{"id": "P1", "materials": ["铝合金", "木材"], "battery": {"status": "not_applicable", "value": null}}, {"id": "P2", "materials": ["ABS"], "battery": {"status": "unknown", "value": null}}, {"id": "P3", "materials": ["ABS", "硅胶"], "battery": {"status": "known", "value": "1200mAh"}}]}