The examples are illustrative of preferred specific implementations of the invention or utility model. The number of embodiments should be determined based on the nature of the invention or utility model, the technical field to which it belongs, the state of the art and the scope of protection claimed. The preferred specific implementation mode for realizing the invention or utility model is an important part of the description. It is extremely important for fully disclosing, understanding and realizing the invention or utility model, and for supporting and interpreting the claims. Therefore, the description should describe in detail the specific implementation methods that the applicant believes are preferred for realizing the invention or utility model. Where appropriate, examples should be given; if there are drawings, the description should be made with reference to the drawings. The preferred specific implementation mode should reflect the technical solution used to solve the technical problem in the application, and should provide a detailed description of the technical features of the claim to support the claim.