Abstract: The present invention provides oxalic amide ligands and uses thereof in copper-catalyzed coupling reaction of aryl halides. Specifically, the present invention provides a use of a compound represented by formula I, wherein definitions of each group are described in the specification. The compound represented by formula I can be used as a ligand in copper-catalyzed coupling reaction of aryl halides for the formation of C—N, C—O and C—S bonds.

Abstract: Disclosed are an image displaying method, apparatus, and device. The image displaying method comprises the following steps: receiving, after a to-be-scanned image is displayed to a user, an image enlargement request for the to-be-scanned image from the user; enlarging the to-be-scanned image according to a preset enlargement rule; and displaying the enlarged to-be-scanned image to the user. The technical solutions of the present invention can solve the problems, in the prior art, of poor flexibility of scanning an image by a user, a low scanning success rate, and a long scanning response time.