Disclosed are a waist girth adjustor which can flexibly adjust a waist girth according to various body types of a wearer wearing trousers, and a pair of trousers having the same. Gaps between characters are found as a window is moved down the text line. The time ratio \u03b4 is set to be smaller than 0. Also provided are inkjet printers that include the inkjet composition. The application programming interface selects, based on the received request, which copy of the data item is to be used when performing the operation. In embodiments of the invention, the frame and sheet may be rolled into a tube for easy and safe transport or mailing.