1. Modeling materials animals: dogs, cats, or monkeys; Drug: Apomorphine hydrochloride.
2. Modeling method: Subcutaneous injection of 1-1.5mg/kg of apomorphine hydrochloride into model animals.
3. Modeling principle: Drug stimulation of the central emetic chemosensory area leads to vomiting in animals.
4. After modeling, animals may experience vomiting within 2-3 minutes.