Fat free
油是免費的

I stopped at a fast food restaurant recently. I was fascinated by a sign which offered Fat Free French Fries. I decided to give them a try. I was dismayed when the clerk pulled a basket of fries from the fryer which were dripping with fat. He filled a bag with these fries and put them in my order. "Just a minute!" I said. 'Those aren't fat free." "Yes, they are. We only charge for the potatoes.... The fat is free!"

有一次我走進一家快餐店，被一個標志牌吸引了，上面寫著“無油薯條”。我打算嘗嘗，但是看到服務員從鍋里撈出的一籃薯條沾滿了油，真是嚇了我一大跳。他給我裝了一袋，賬單上顯示出價錢。“等會兒，”我說，“這不是無油的？”“是的，我們只對薯條收費，油是免費的！”