二、試述作業系統中 virtual memory working set 的意義及其用途。（10 分）

一、英譯中：請將下列英文譯為中文。（20 分） We benefit from taxing our brains with the mental exercise of humor, much as we benefit from the physical exercise of a long run or a tough tennis match. Comedy extends our mental stamina and improves our mental flexibility. Having an active sense of humor helps us to get more from life, both cognitively and emotionally.