Novel compositions containing conjugated linoleic acids are efficacious as animal feed additives and human dietary supplements. Furthermore, the present invention also provides a 3-dimension scanning method. The arc tube is formed at its opposite ends with electrodes which gives an arc discharge therebetween. The retrieved document information is marked with a crawl number. The target display rate can be established solely by a user instruction, by analysis of the audiovisual data, or by modification of a user-specified nominal target display rate based upon analysis of the audiovisual data.