The present invention discloses a novel use of the FGD byproduct from thermal power plants and facilities and the specific method for alkali soil amelioration. Generally, the annotation technique includes compiling visual features and textual information from a number of images, hashing the images visual features, and clustering the images based on their hash values. The medical device may also include a sensor disposed on the hat or annular securing device. The front end and the rear end of the second terminal group extend beyond the second terminal insulator. The charge signals only have to travel a short distance from a photodiode to an adjacent vertical shift register.