Task: Sentence Expansion
Input (English): An annular hurricane is a rare type of hurricane that has a big , circular eyewall , and thick , deep convection around it with no spiral rainbands .
Output (English): An annular tropical cyclone is a tropical cyclone that features a normal to large , symmetric eye surrounded by a thick and uniform ring of intense convection , often having a relative lack of discrete rainbands , and bearing a symmetric appearance in general .