Disclosed is an expandable percutaneous sheath, for introduction into the body while in a first, low cross-sectional area configuration, and subsequent expansion to a second, enlarged cross-sectional configuration. Methods for preparing the compositions are also described. Various disease in plants can be controlled by the invention and that of grape downy mildew, rice sheath and culm blight, rice blast, tomato early blight, tomato late blight, wheat leaf rust, wheat leaf blotch, wheat powdery mildew, cucumber powdery mildew, cucumber downy mildew, cucumber grey mold and so on. An inner wall of the second cover is provided with a plurality of second terminal holders. Thus, the protective module is combined with the rim rigidly and stably so that the glasses can provide a protective function to the user. If the score is less than a predefined threshold, a new model for the training segment is created and added to the pool.