A Grin Without a Cat at the time of the spread of the Revolution (literally translated as "smile without a Cat") is the historical work of Keith Lanca, which began in 1967 (Canada saw it as a real turning point), focusing on the global fire of the 1960s and 1970s to explore the political ups and downs of the decade from the international field. Including Vietnam, Poland, May Storm, Prague, Chile, and the fate of the new left. It was released in France in 1978 and was republished 15 years later. The film is divided into two parts, each organized by the branch line: the first part: "weak hands" 1. From Vietnam to the death of Guzhibola. 2. A variety of May storms in 1968. The second part: "palm" 1. From the Prague Spring to the common cause of the French government. two。 Where does it go from Chile? Introduce: compared the cheer of the Olympic movement and the rock culture of the western youth, the parade of the ideal of peace in Prague on the eve of the reform, and all kinds of women's liberation since the 1970s, a utopian retrospective history of the youth reform society. From 1967 to 1977 from a personal point of view.