The abstract of the specification can contain the chemical formula that best explains the invention; An application for a patent with drawings shall also provide a drawing that best illustrates the technical characteristics of the invention or utility model. The size and clarity of the attached drawings shall ensure that all the details in the drawings can still be clearly distinguished when the drawings are reduced to 4cm× 6cm. The abstract text shall not exceed 300 words. Commercial advertising language shall not be used in the abstract.