Option 1: Take out overseas insurance for one year, covering medical insurance for accidents and diseases. When you go abroad for medical treatment, you can call the emergency rescue number, and the rescue agency will arrange for medical treatment and advance medical expenses within the scope of responsibility.
Option 2, you can take out short-term travel insurance, and you can take out local health insurance when you arrive in Australia, but you'd better know the price and service from local friends in advance before going abroad.