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運籌學
??? 情景例句
Thank you.
謝謝你。
Feed sparingly and defy the physician.
飲食有節，醫生絕跡。
They got on so well that Fred decided not to go to the lecture but to show the tourist around the university instead.
他們相處得很融洽，于是弗雷德決定不去聽課，而帶領這位游客到這所大學各處參觀。