If someone’s a piece of work, they’re a real pain in the rear.Merriam-Webster defines a piece of work as “a complicated, difficult, or eccentric person.”The expression appears to derive from Hamlet: “What a piece of work is a man!”
這句話的大意：如果說某人是“a piece of work”，其身後常背負真正的痛苦。韋氏詞典將"a piece of work"定義為:"壹個復雜、 困難或古怪的人"。這個表達似乎源自《哈姆雷特 》：“What a piece of work is a man!” 其中，What a piece of work is a man! 常被翻譯為：人類是壹件多麽了不得的傑作！
故 you're a piece of work. 可以理解為：您真是個“傑作”。（通常含諷意）。理解時，褒貶之意，壹定要看背景和語境。