In the descriptions of the embodiments of the disclosure, terms “first” and “second” are only adopted for description and should not be understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Therefore, features defined by “first” and “second” may explicitly or implicitly indicate inclusion of one or more of such features. In the descriptions of the embodiments of the disclosure, “multiple” means two or more unless otherwise limited definitely and specifically.

In the descriptions of the embodiments of the disclosure, unless otherwise specified and limited, terms “mounting”, “mutual connection” and “connection” should be generally understood. For example, it may be fixed connection or detachable connection or integral connection, may be mechanical connection, electrical connection or mutual communication, a may be direct connection or indirect connection through an intermediate, or may be communication inside two elements or interaction between two elements. Those of ordinary skill in the art can understand specific implications of the above terms in the embodiments of the disclosure according to specific situations.

In the description of the present specification, the description with reference to the terms “one embodiment”, “some embodiments”, “illustrative embodiment”, “example”, “specific example”, or “some examples”, etc. means that specific features, structures, materials or characteristics described in conjunction with embodiments or examples are included in at least one embodiment or example of the disclosure. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.